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  • PGT-A vs. PGT-P: Understanding Polygenic Risk Scoring in IVF

    Understanding PGT-A and PGT-P

    If you are exploring IVF with genetic testing, you may have come across terms like PGT-A and PGT-P. While both are types of preimplantation genetic testing, they serve different purposes. PGT-A (preimplantation genetic testing for aneuploidy) checks embryos for the correct number of chromosomes, while PGT-P (preimplantation genetic testing for polygenic risk scoring) estimates the likelihood of developing certain common conditions influenced by multiple genes. This article explains the key differences, the experimental status of PGT-P, and important considerations for patients.

    At a Glance

    • PGT-A: Screens for chromosomal abnormalities (aneuploidy) to select embryos with the correct chromosome number.
    • PGT-P: Estimates polygenic risk for conditions like diabetes, heart disease, or certain cancers, based on many genetic variants.
    • Status: PGT-A is widely used; PGT-P is considered experimental and not widely offered.
    • Limitations: Both tests have limitations and cannot guarantee a healthy baby.

    What Is PGT-A?

    PGT-A, previously known as preimplantation genetic screening (PGS), is a test performed on embryos created through IVF. It checks for aneuploidy—an abnormal number of chromosomes. Most embryos with aneuploidy fail to implant or result in miscarriage. By selecting embryos with the correct chromosome number, PGT-A may improve the chances of a successful pregnancy, especially for women of advanced maternal age or those with recurrent pregnancy loss.

    PGT-A is a well-established procedure in many fertility clinics. However, it is not a guarantee of pregnancy or a healthy baby. Some embryos with normal chromosomes may still fail to implant, and other factors such as uterine health and embryo quality play a role.

    What Is PGT-P?

    PGT-P is a newer, experimental test that aims to assess the risk of developing polygenic conditions—those influenced by multiple genes and environmental factors. Examples include type 2 diabetes, coronary artery disease, certain cancers, and autoimmune disorders. PGT-P uses a polygenic risk score (PRS), which aggregates the effects of many genetic variants to estimate an individual’s likelihood of developing a condition.

    Unlike PGT-A, which looks at chromosome number, PGT-P analyzes specific genetic markers associated with common diseases. The idea is to select embryos with lower polygenic risk scores, potentially reducing the chance of these conditions in offspring. However, PGT-P is not widely available and is considered experimental by many professional organizations.

    Key Differences Between PGT-A and PGT-P

    Aspect PGT-A PGT-P
    Purpose Detect chromosomal abnormalities (aneuploidy) Estimate polygenic risk for common conditions
    What it analyzes Chromosome number (23 pairs) Multiple genetic variants associated with specific diseases
    Clinical status Widely used in IVF Experimental, not widely offered
    Conditions targeted Chromosomal disorders like Down syndrome Polygenic conditions like diabetes, heart disease
    Result interpretation Normal or abnormal chromosome count Risk score (low, medium, high) for each condition
    Limitations Cannot detect all genetic abnormalities; not a guarantee Limited predictive power; ethical concerns; not clinically validated

    How PGT-P Works

    PGT-P involves several steps. After embryos are created through IVF, a few cells are biopsied from each embryo. The DNA is then analyzed for thousands of genetic variants known to influence polygenic conditions. A polygenic risk score is calculated for each embryo, and embryos with lower risk scores may be prioritized for transfer.

    However, the science behind PGT-P is still evolving. The predictive accuracy of polygenic risk scores varies by condition and population. For many conditions, the scores explain only a small fraction of the overall risk, which is also influenced by lifestyle and environment. This means that a low-risk embryo could still develop the condition, and a high-risk embryo might not.

    Limitations and Ethical Considerations

    Both PGT-A and PGT-P have limitations. PGT-A cannot detect all genetic abnormalities, such as single-gene disorders or structural rearrangements. It also cannot predict the severity of a condition if a chromosomal abnormality is present.

    PGT-P has additional limitations. It is not clinically validated, meaning its ability to predict disease risk is not well-established. There are also ethical concerns about selecting embryos based on polygenic risk, including the potential for discrimination and the psychological impact on families. Some experts worry that PGT-P may give a false sense of control, as many polygenic conditions are preventable or manageable through lifestyle changes.

    Professional organizations, such as the American Society for Reproductive Medicine (ASRM), have expressed caution about PGT-P, noting that it should be offered only in research settings until more evidence is available.

    Should You Consider PGT-P?

    If you are considering PGT-P, it is important to understand that it is not a standard part of IVF. Most clinics do not offer it, and those that do may have specific criteria. Before deciding, ask your clinic about the following:

    • Is PGT-P available at your clinic? If so, what is the process?
    • What conditions does the test screen for?
    • How accurate are the risk scores for your ethnic background?
    • What are the costs, and are they covered by insurance?
    • What are the limitations and potential risks?

    It is also crucial to consider the emotional and ethical implications. PGT-P results may cause anxiety or lead to difficult decisions. Genetic counseling is strongly recommended to help you understand the results and make informed choices.

    Questions to Ask Your Clinic

    When discussing PGT-A or PGT-P with your fertility specialist, consider asking:

    • Why do you recommend this test for my situation?
    • What are the risks of the biopsy procedure?
    • How long does it take to get results?
    • What are the success rates with and without this testing?
    • Are there alternative tests or approaches?

    Next Steps

    If you are exploring genetic testing as part of your IVF journey, start by researching reputable clinics and scheduling consultations. Ask about their experience with PGT-A and whether they offer PGT-P. Remember that no test can guarantee a healthy baby, and all decisions should be made in consultation with your medical team.

    For more information on PGT in Thailand, visit our PGT in Thailand page. You can also explore our guides and FAQ sections for additional resources.

    Frequently asked questions

    Is PGT-P the same as PGT-A?

    No, they are different tests. PGT-A checks for chromosomal abnormalities (aneuploidy), while PGT-P estimates polygenic risk for common conditions like diabetes or heart disease. PGT-P is experimental and not widely offered.

    What is a polygenic risk score?

    A polygenic risk score (PRS) is a calculation based on many genetic variants that together influence the likelihood of developing a particular condition. It is used in PGT-P to estimate an embryo's risk for polygenic diseases.

    Is PGT-P available in Thailand?

    PGT-P is not widely available anywhere, including Thailand. It is considered experimental, and most clinics do not offer it. If you are interested, you should ask your clinic directly about availability and whether they participate in research studies.

    Can PGT-P guarantee that my child won't develop a disease?

    No, PGT-P cannot guarantee that a child will not develop a polygenic condition. It only provides a risk estimate, and many factors, including lifestyle and environment, play a significant role. The predictive power of polygenic risk scores is limited.

    What are the ethical concerns with PGT-P?

    Ethical concerns include the potential for discrimination based on genetic risk, the psychological impact on families, and the risk of giving a false sense of control. Some experts worry about the lack of clinical validation and the possibility of selecting embryos for non-medical traits.

    Continue your research

    Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.

  • Understanding PGT Results: What a Normal Result Means

    Waiting for preimplantation genetic testing (PGT) results can be a time of uncertainty. You may wonder what the report will show, how to interpret the terms, and what a “normal” result really means for your embryo. This guide explains the typical structure of a PGT report, defines common terms, and offers questions to ask your clinic so you can approach the results with more confidence.

    At a Glance: Key Points About PGT Results

    • PGT results are reported per embryo, not per cycle.
    • Terms like “euploid,” “aneuploid,” and “mosaic” describe the genetic status of an embryo.
    • A “normal” result means no chromosomal abnormalities were detected by the test, but it does not guarantee pregnancy or a healthy baby.
    • PGT is a screening tool, not a diagnostic test, and it has limitations.
    • Your clinic will explain the results in the context of your specific situation.

    What Is PGT and Why Is It Done?

    PGT is a test performed on embryos created through in vitro fertilization (IVF) before transfer to the uterus. It is used to identify embryos that may have certain genetic or chromosomal issues. There are three main types:

    • PGT-A (aneuploidy screening): Checks for the correct number of chromosomes. Embryos with the correct number are called “euploid,” while those with missing or extra chromosomes are “aneuploid.”
    • PGT-M (monogenic disorders): Looks for specific inherited single-gene conditions, such as cystic fibrosis or sickle cell anemia.
    • PGT-SR (structural rearrangements): Detects chromosomal structural changes, such as translocations, that may affect embryo development.

    PGT is not for everyone. It is often recommended for certain situations, such as advanced maternal age, recurrent pregnancy loss, or a known genetic condition in the family. Your clinic will advise whether PGT is appropriate for you.

    How Are PGT Results Reported?

    PGT results are typically provided in a laboratory report that lists each embryo tested and its result. The report may include:

    • Embryo identification number
    • Type of PGT performed (e.g., PGT-A)
    • Result category (e.g., euploid, aneuploid, mosaic)
    • Additional notes or recommendations

    Results are usually given as one of the following:

    • Euploid (normal): The embryo has the expected number of chromosomes (for PGT-A) or does not carry the specific genetic variant tested (for PGT-M/SR).
    • Aneuploid (abnormal): The embryo has an abnormal number of chromosomes.
    • Mosaic: The embryo has a mix of normal and abnormal cells. This is a newer category, and its implications are still being studied.
    • Inconclusive: The test did not yield a clear result, possibly due to technical issues or insufficient DNA.

    It is important to note that PGT results are not always black and white. For example, a “normal” result in PGT-A means no chromosomal abnormalities were detected, but it does not rule out all genetic conditions or guarantee a successful pregnancy.

    What Does a “Normal” Result Mean?

    A normal PGT result is reassuring, but it is not a guarantee. Here’s what it does and does not mean:

    • It means: The embryo appears to have the correct number of chromosomes (for PGT-A) or does not carry the specific genetic condition tested (for PGT-M/SR).
    • It does not mean: The embryo is guaranteed to implant, result in a live birth, or be free of all health issues. PGT cannot detect all genetic or chromosomal abnormalities, and it does not assess the embryo’s overall viability.

    In other words, a normal PGT result is a positive sign, but it is just one piece of information. Other factors, such as embryo quality, uterine environment, and overall health, also play a role.

    Understanding Mosaic Results

    Mosaic embryos have both normal and abnormal cells. The percentage of abnormal cells can vary, and the clinical significance is still being researched. Some clinics may consider transferring a mosaic embryo if no euploid embryos are available, but this decision is made on a case-by-case basis. It is essential to discuss the specific mosaic level and its potential implications with your clinic.

    Limitations of PGT

    PGT is a powerful tool, but it has limitations:

    • Not diagnostic: PGT is a screening test, not a diagnostic test. It cannot detect all genetic conditions or chromosomal abnormalities.
    • Technical limitations: The test may fail to amplify DNA or produce inconclusive results.
    • Embryo biopsy risks: The biopsy procedure, though generally safe, may have a small risk of damaging the embryo.
    • Not a guarantee: Even a normal embryo may not lead to a pregnancy due to other factors.

    Understanding these limitations can help you interpret your results with realistic expectations.

    Questions to Ask Your Clinic About PGT Results

    When you receive your PGT report, consider asking your clinic the following questions:

    • What does this result mean for my specific embryo?
    • How reliable is the test for the condition we were screening for?
    • If the result is mosaic, what is the percentage of abnormal cells, and what are the potential outcomes?
    • Are there any additional tests or follow-up steps recommended?
    • How does this result affect the decision to transfer the embryo?

    These questions can help you make an informed decision about next steps.

    Next Steps After Receiving PGT Results

    After you receive your PGT results, your clinic will discuss the options with you. These may include:

    • Transferring a euploid embryo
    • Discussing the possibility of transferring a mosaic embryo (if applicable)
    • Considering additional testing or consultation with a genetic counselor
    • Deciding whether to freeze or discard embryos based on results

    Take your time to process the information and ask for clarification if needed. Your clinic is there to support you.

    Conclusion

    PGT results can be complex, but understanding the basics can reduce anxiety and help you make informed decisions. Remember that a normal result is a positive sign, but it is not a guarantee. Always discuss your results with your clinic and ask questions to ensure you fully understand what they mean for your journey.

    Frequently asked questions

    What is the difference between PGT-A, PGT-M, and PGT-SR?

    PGT-A screens for an abnormal number of chromosomes (aneuploidy). PGT-M tests for specific single-gene disorders. PGT-SR checks for structural changes in chromosomes, such as translocations.

    Does a normal PGT result guarantee a healthy baby?

    No. A normal PGT result means no chromosomal abnormalities were detected, but it does not guarantee pregnancy, live birth, or the absence of all health issues. PGT cannot detect all genetic conditions.

    What is a mosaic embryo?

    A mosaic embryo has a mix of normal and abnormal cells. The clinical significance is still being studied, and the decision to transfer a mosaic embryo is made on a case-by-case basis.

    What should I do if my PGT result is inconclusive?

    An inconclusive result means the test did not yield a clear answer. Your clinic may recommend repeating the test, or you may consider other options. Discuss the next steps with your clinic.

    Can PGT detect all genetic disorders?

    No. PGT is a screening test that can detect specific chromosomal abnormalities or single-gene disorders, but it cannot detect all genetic conditions or birth defects.

    Continue your research

    Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.

  • What PGT-A Can and Cannot Tell You: Understanding Its Limitations

    What is PGT-A?

    Preimplantation Genetic Testing for Aneuploidy (PGT-A) is a screening test used during IVF to check embryos for an abnormal number of chromosomes. It helps embryologists select embryos that are more likely to implant and develop normally. However, PGT-A is not a guarantee of a healthy pregnancy or baby, and it has important limitations that you should understand before deciding whether to use it.

    At a Glance: Key Limitations of PGT-A

    • PGT-A cannot detect all genetic disorders, only chromosomal number abnormalities.
    • It cannot identify structural chromosome rearrangements (that’s PGT-SR).
    • It cannot detect single-gene disorders (that’s PGT-M).
    • Mosaicism results may be uncertain and require confirmatory testing.
    • PGT-A does not eliminate the risk of miscarriage or birth defects.
    • It cannot predict the health of a future child.

    What PGT-A Can Detect

    PGT-A screens for aneuploidy, which means having too many or too few chromosomes. This is a common cause of implantation failure and miscarriage. By identifying embryos with the correct number of chromosomes (euploid), PGT-A can help reduce the risk of miscarriage and improve the chances of a successful pregnancy in certain situations.

    What PGT-A Cannot Detect

    Single-Gene Disorders

    PGT-A does not test for specific genetic diseases like cystic fibrosis, sickle cell anemia, or Huntington’s disease. For those, you would need PGT-M (Preimplantation Genetic Testing for Monogenic disorders), which is a different test that looks for specific gene mutations.

    Structural Chromosome Abnormalities

    PGT-A does not detect balanced translocations or other structural rearrangements of chromosomes. If you or your partner have a known chromosomal rearrangement, PGT-SR (Preimplantation Genetic Testing for Structural Rearrangements) is the appropriate test.

    Mosaicism

    Mosaicism occurs when an embryo has both normal and abnormal cells. PGT-A may report an embryo as mosaic, meaning it has a mix of cells with different chromosome numbers. The clinical significance of mosaicism is not fully understood, and the accuracy of the result depends on the biopsy sample. A mosaic embryo may still lead to a healthy baby, but it carries a higher risk of abnormalities. Confirmatory testing, such as prenatal diagnosis (amniocentesis or CVS), is often recommended if a mosaic embryo is transferred.

    Epigenetic and Multifactorial Conditions

    PGT-A does not assess epigenetic changes (how genes are expressed) or complex conditions like autism, diabetes, or heart disease, which are influenced by multiple genes and environmental factors.

    Why PGT-A Results Are Not Absolute

    PGT-A is a screening test, not a diagnostic test. It provides information about the chromosomes in the cells biopsied from the embryo, but it cannot guarantee that the embryo is completely normal. The biopsy samples only a few cells from the trophectoderm (the part that becomes the placenta), which may not represent the entire embryo. Additionally, technical limitations can lead to false positives or false negatives.

    The Need for Confirmatory Testing

    If you become pregnant after transferring a PGT-A tested embryo, your doctor may recommend prenatal testing, such as chorionic villus sampling (CVS) or amniocentesis, to confirm the chromosomal status of the fetus. This is especially important if the embryo was mosaic or if you have other risk factors.

    Questions to Ask Your Clinic

    • What type of genetic testing does your lab use for PGT-A?
    • How does your clinic report mosaicism, and what is your policy on transferring mosaic embryos?
    • What is the accuracy rate of PGT-A at your lab?
    • Do you recommend confirmatory testing after a PGT-A pregnancy?
    • What are the costs and timelines for PGT-A?

    Next Steps: Making an Informed Decision

    Before deciding on PGT-A, discuss with your fertility specialist:

    • Your medical history and reasons for considering PGT-A.
    • The limitations and potential benefits in your specific situation.
    • Alternative options, such as not testing or using other screening methods.
    • The emotional and financial implications.

    Remember, PGT-A is a tool to help you make informed choices, but it is not a guarantee. Take your time, ask questions, and consider genetic counseling if needed.

    For more information, explore our PGT in Thailand guide, visit our guides, or check our FAQ section.

    Frequently asked questions

    Can PGT-A detect all genetic abnormalities?

    No, PGT-A only screens for an abnormal number of chromosomes (aneuploidy). It does not detect single-gene disorders, structural rearrangements, or complex conditions influenced by multiple genes and environment.

    What is mosaicism in PGT-A results?

    Mosaicism means an embryo has a mix of normal and abnormal cells. PGT-A may report an embryo as mosaic, but the clinical significance is uncertain. Confirmatory testing is often recommended if a mosaic embryo is transferred.

    Is PGT-A a guarantee of a healthy baby?

    No, PGT-A is a screening test that reduces the risk of miscarriage and chromosomal abnormalities, but it cannot guarantee a healthy pregnancy or baby. It does not detect all genetic conditions or birth defects.

    Do I need confirmatory testing after PGT-A?

    Your doctor may recommend prenatal testing, such as CVS or amniocentesis, to confirm the chromosomal status of the fetus, especially if the embryo was mosaic or you have other risk factors.

    What is the difference between PGT-A and PGT-M?

    PGT-A screens for an abnormal number of chromosomes, while PGT-M tests for specific single-gene disorders. They are used for different purposes and can be done together if needed.

    Continue your research

    Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.

  • How PGT-A Affects the Number of Embryos Available for Transfer

    When you undergo IVF, the number of embryos you have can drop at several stages. PGT-A (preimplantation genetic testing for aneuploidy) is one of those stages. It screens embryos for chromosomal abnormalities before transfer. Because not all embryos will be chromosomally normal, PGT-A can reduce the number of embryos available for transfer. This article explains why that happens, what it means for your decisions, and how to plan for the possibility of needing more than one cycle.

    At a Glance

    • PGT-A tests embryos for chromosomal abnormalities.
    • Not all embryos will be normal, so the number available for transfer may decrease.
    • This reduction is part of the IVF process and can affect your timeline and decisions.
    • Planning for multiple cycles can help manage expectations.

    What Is PGT-A?

    PGT-A is a genetic test performed on embryos created through IVF. It checks for aneuploidy, which means having an abnormal number of chromosomes. Embryos with the correct number of chromosomes (46) are considered euploid and are more likely to implant and develop normally. Embryos with missing or extra chromosomes are aneuploid and may fail to implant or result in miscarriage.

    PGT-A is not a guarantee of a successful pregnancy, but it provides information that can help you and your clinic decide which embryos to transfer.

    How PGT-A Reduces the Number of Usable Embryos

    During IVF, you may produce several embryos. After fertilization, embryos are cultured for a few days. At the blastocyst stage, a few cells are biopsied and sent for PGT-A testing. The results typically categorize embryos as:

    • Euploid: normal chromosome number, suitable for transfer.
    • Aneuploid: abnormal chromosome number, generally not recommended for transfer.
    • Mosaic: a mix of normal and abnormal cells, which may have reduced potential.

    Because a significant proportion of embryos can be aneuploid, especially as maternal age increases, the number of embryos that are suitable for transfer may be lower than the total number of embryos you produce. This is often called embryo attrition.

    What This Means for Your Decision-Making

    Knowing that PGT-A can reduce the number of available embryos helps you prepare emotionally and practically. Here are some key points to consider:

    • Expect attrition: It is normal for not all embryos to be normal. Discuss with your clinic what percentage of embryos typically come back as euploid for your age group.
    • Transfer decisions: If you have fewer euploid embryos, you may need to decide how many to transfer in a single cycle. Your clinic will guide you based on your situation.
    • Consider all options: If you have no euploid embryos, you may need to consider another IVF cycle, using donor eggs, or other alternatives. Your clinic can discuss these options with you.

    Planning for Multiple Cycles

    Because PGT-A can reduce the number of transferable embryos, it is wise to plan for the possibility of more than one IVF cycle. Here are some steps to consider:

    1. Discuss your goals: Talk to your clinic about how many embryos you hope to have for transfer and whether you are open to multiple cycles.
    2. Understand your ovarian reserve: Your age and ovarian reserve affect how many eggs you are likely to produce. This can influence the number of embryos you may get.
    3. Budget and time: Multiple cycles involve additional time and cost. Ask your clinic for a breakdown of costs per cycle and any package deals.
    4. Emotional preparation: The uncertainty of embryo numbers can be stressful. Consider counseling or support groups.

    Questions to Ask Your Clinic

    To make informed decisions, ask your clinic the following questions:

    • What is the expected attrition rate from eggs to blastocysts and then to euploid embryos for someone my age?
    • How many embryos do you recommend we aim for before considering transfer?
    • What are the options if we have no euploid embryos?
    • Are there any additional tests or procedures that might help?

    Next Steps

    If you are considering PGT-A, take these steps:

    1. Consult with a fertility specialist to understand if PGT-A is right for you.
    2. Ask for a detailed explanation of the testing process and what the results mean.
    3. Plan financially and emotionally for the possibility of multiple cycles.
    4. Explore resources on PGT in Thailand and general guides to help you prepare.

    Remember, PGT-A is a tool to provide information, not a guarantee. The number of embryos available for transfer can be lower than expected, but this knowledge helps you make the best decisions for your family-building journey.

    Frequently asked questions

    Does PGT-A always reduce the number of embryos available?

    Not always, but it can. PGT-A identifies embryos with chromosomal abnormalities, and those are typically not transferred. The reduction depends on factors like maternal age and embryo quality. Some patients may have many euploid embryos, while others may have few or none.

    What happens if I have no euploid embryos after PGT-A?

    If no embryos are euploid, your clinic will discuss options such as another IVF cycle, using donor eggs, or considering mosaic embryos. The decision depends on your individual situation and should be made with your medical team.

    Can PGT-A improve my chances of pregnancy?

    PGT-A can help select embryos that are more likely to implant, but it does not guarantee pregnancy. It may reduce the risk of miscarriage due to chromosomal abnormalities, but other factors also affect success.

    Is PGT-A recommended for everyone?

    No. PGT-A is often recommended for women over 35, those with recurrent miscarriage, or previous failed IVF cycles. However, it is not necessary for everyone. Your clinic can advise based on your medical history.

    Continue your research

    Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.

  • PGT-A, PGT-M, and PGT-SR: What’s the Difference?

    If you are exploring IVF and preimplantation genetic testing (PGT), you may have come across terms like PGT-A, PGT-M, and PGT-SR. These are three distinct types of genetic testing that can be performed on embryos before transfer. Understanding what each test does—and what it does not do—can help you ask better questions and make more informed decisions with your fertility team.

    In simple terms: PGT-A checks for the correct number of chromosomes, PGT-M looks for a specific single-gene disorder, and PGT-SR checks for structural changes in chromosomes. Each test serves a different purpose and is used in different clinical situations. This guide explains the basics, the limitations, and the questions you may want to ask your clinic.

    At a Glance: The Three PGT Types

    • PGT-A (Aneuploidy Screening): Counts chromosomes to identify embryos with an abnormal number (aneuploidy).
    • PGT-M (Monogenic Disorders): Tests for a specific inherited condition caused by a single gene, such as cystic fibrosis or sickle cell disease.
    • PGT-SR (Structural Rearrangements): Detects unbalanced chromosome rearrangements, such as translocations or inversions.

    What Is PGT-A?

    PGT-A, previously known as preimplantation genetic screening (PGS), is designed to detect an abnormal number of chromosomes in an embryo. Humans typically have 46 chromosomes in each cell. An embryo with too many or too few chromosomes is said to be aneuploid. Most aneuploid embryos fail to implant or result in miscarriage, though some can lead to conditions like Down syndrome (trisomy 21).

    PGT-A is often considered for patients who want to reduce the risk of miscarriage or who have had repeated implantation failure. It may also be used in cases of advanced maternal age, where the likelihood of aneuploidy is higher. However, PGT-A does not guarantee a successful pregnancy, and it cannot detect all genetic abnormalities.

    How PGT-A Works

    During an IVF cycle, embryos are cultured for several days until they reach the blastocyst stage. A small number of cells are then removed from the outer layer of the embryo (trophectoderm) and sent for genetic analysis. The embryo is frozen while the results are pending. Only embryos with the expected number of chromosomes are considered for transfer.

    Limitations of PGT-A

    PGT-A is not a test for every genetic condition. It does not screen for single-gene disorders or structural rearrangements. Additionally, because the test is performed on a few cells, there is a small chance that the results may not perfectly reflect the entire embryo (a phenomenon called mosaicism). Your clinic can explain how they interpret mosaic results.

    What Is PGT-M?

    PGT-M, formerly known as preimplantation genetic diagnosis (PGD), is used when one or both parents carry a known genetic mutation for a specific single-gene disorder. This test identifies embryos that have inherited the mutation, allowing the transfer of embryos that are unaffected.

    PGT-M is typically offered to couples who have a family history of a genetic condition, such as cystic fibrosis, Tay-Sachs disease, or Huntington’s disease. It requires prior knowledge of the exact genetic mutation, which is usually confirmed through carrier screening or genetic testing of the parents.

    How PGT-M Works

    Before starting an IVF cycle, the clinic may need to develop a personalized test for the specific mutation. This often involves a “work-up” phase where DNA samples from the parents and sometimes other family members are analyzed. Once the test is ready, embryos are biopsied and tested for the presence of the mutation. Only embryos without the mutation are considered for transfer.

    Limitations of PGT-M

    PGT-M is highly specific to the tested mutation. It does not screen for other genetic conditions or chromosomal abnormalities unless combined with PGT-A. The process can be time-consuming and may require additional planning. It is also not available for every genetic condition, so you should confirm with your clinic whether your specific situation can be tested.

    What Is PGT-SR?

    PGT-SR is used when one or both parents have a structural rearrangement of their chromosomes, such as a translocation or inversion. These rearrangements may not cause health problems in the parent, but they can lead to embryos with unbalanced chromosomes, which may result in miscarriage, stillbirth, or a child with disabilities.

    PGT-SR identifies embryos with balanced chromosomes, meaning they have the correct amount of genetic material. This test is often recommended for couples who have experienced recurrent miscarriages or who have a known chromosomal rearrangement.

    How PGT-SR Works

    Like PGT-A, PGT-SR involves embryo biopsy and genetic analysis. The laboratory looks for specific structural abnormalities in the chromosomes. The process may be combined with PGT-A to also check for aneuploidy, as structural rearrangements can increase the risk of aneuploidy.

    Limitations of PGT-SR

    PGT-SR does not correct the rearrangement; it only helps select embryos that are balanced. It also does not detect all types of chromosomal abnormalities. As with other PGT types, there is a small risk of misdiagnosis, and the test cannot guarantee a healthy baby.

    Comparing PGT-A, PGT-M, and PGT-SR

    Feature PGT-A PGT-M PGT-SR
    What it screens for Abnormal number of chromosomes (aneuploidy) Specific single-gene disorder Structural chromosome rearrangements
    Typical reason for testing Advanced maternal age, repeated implantation failure, recurrent miscarriage Known genetic mutation in one or both parents Known chromosomal rearrangement in a parent
    Requires prior genetic information No Yes, the specific mutation must be known Yes, the rearrangement must be identified
    Can be combined with other PGT Yes, often combined with PGT-M or PGT-SR Yes, often combined with PGT-A Yes, often combined with PGT-A
    Does it guarantee a healthy baby? No No No

    Which Test Is Right for You?

    The choice of PGT type depends on your medical history, genetic background, and the reason for undergoing IVF. There is no one-size-fits-all answer. Your fertility specialist and a genetic counselor can help you determine whether PGT is appropriate and which type(s) may be beneficial.

    For example, if you are over 35 and concerned about aneuploidy, PGT-A might be discussed. If you and your partner are carriers of a recessive disorder, PGT-M may be offered. If you have a translocation, PGT-SR could be recommended. In some cases, a combination of tests may be used.

    Questions to Ask Your Clinic

    • What type of PGT do you recommend for my situation, and why?
    • What is the process for embryo biopsy, and how many cells are removed?
    • How long does it take to get results, and will my embryos be frozen in the meantime?
    • What are the risks and limitations of the recommended test?
    • How does your laboratory handle mosaicism or inconclusive results?
    • What are the costs involved, and are they included in the IVF package?

    Alternatives and Additional Considerations

    PGT is not the only way to assess embryo health. Some patients may choose not to undergo PGT and instead rely on embryo morphology (appearance) for selection. Others may consider prenatal testing during pregnancy, such as chorionic villus sampling or amniocentesis, to confirm genetic status.

    It is also important to note that PGT does not eliminate all risks. Even with PGT, there is a small chance of misdiagnosis, and not all genetic conditions can be tested. Furthermore, PGT does not guarantee implantation, pregnancy, or a live birth.

    Next Steps

    If you are considering PGT, start by gathering your medical records and any genetic test results. Consult with a fertility specialist who can explain the options in the context of your specific situation. A genetic counselor can also provide valuable insight into the implications of testing.

    When researching clinics, ask about their experience with PGT, their laboratory protocols, and how they communicate results. You may also want to explore our PGT in Thailand page for an overview of what to consider when seeking treatment abroad.

    For more general information, visit our guides section, or check the FAQ for common questions about fertility treatment.

    Frequently asked questions

    Can PGT-A, PGT-M, and PGT-SR be done at the same time?

    Yes, it is possible to combine PGT-A with PGT-M or PGT-SR in a single biopsy. This allows the laboratory to check for aneuploidy as well as the specific genetic condition or structural rearrangement. However, not all clinics offer combined testing, and the feasibility may depend on the laboratory's protocols and the amount of DNA available from the biopsy.

    Does PGT guarantee a healthy baby?

    No. PGT can reduce the risk of transferring an embryo with a specific genetic abnormality, but it cannot guarantee a successful pregnancy or a healthy baby. There are many factors that affect pregnancy outcomes, and PGT does not screen for all possible genetic or developmental issues.

    Is PGT mandatory for all IVF patients?

    No, PGT is not mandatory. It is an optional test that may be recommended based on your medical history, age, or genetic background. Some patients choose not to undergo PGT, and the decision should be made in consultation with your fertility specialist and genetic counselor.

    What is the difference between PGT-A and PGT-M?

    PGT-A screens for an abnormal number of chromosomes (aneuploidy), while PGT-M tests for a specific single-gene disorder. PGT-A is often used to improve the chances of implantation and reduce miscarriage risk, whereas PGT-M is used when parents carry a known genetic mutation.

    How long does PGT take?

    The time required for PGT can vary. After embryo biopsy, results may take several days to a few weeks, depending on the laboratory and the type of test. During this time, embryos are typically frozen. Your clinic can provide a more specific timeline based on their procedures.

    Continue your research

    Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.

  • How Long Does PGT-A Biopsy Take and Does It Add Time to an IVF Cycle in Thailand?

    If you are considering preimplantation genetic testing for aneuploidy (PGT-A) as part of an IVF cycle in Thailand, you likely want to know how the biopsy step fits into your overall timeline. The biopsy itself is a short procedure, but the full impact on your cycle depends on several factors, including embryo development, laboratory scheduling, and the testing method used. This guide explains the process and helps you plan your travel and expectations.

    At a Glance: PGT-A Biopsy and IVF Timeline

    • Biopsy procedure: A few minutes per embryo, performed by an embryologist.
    • Timing: Usually occurs on day 5 or day 6 of embryo development (blastocyst stage).
    • Result wait: Typically several days to a couple of weeks, depending on the testing method and lab.
    • Cycle impact: The biopsy adds a laboratory step, but the main time consideration is the wait for results before a frozen embryo transfer.

    What Is PGT-A Biopsy?

    PGT-A is a genetic test that screens embryos for an abnormal number of chromosomes (aneuploidy). To perform the test, a small number of cells are removed from the outer layer of the embryo (trophectoderm), which will later become the placenta. This is called a biopsy. The embryo itself is not harmed; the cells are taken from the part that does not become the baby.

    The biopsy is performed by an embryologist using a precise laser and a tiny pipette. It is a delicate procedure that requires skill and experience. The entire biopsy process for one embryo typically takes only a few minutes, but the laboratory must also prepare the cells for genetic analysis.

    How the Biopsy Fits into the IVF Timeline

    In a standard IVF cycle, eggs are retrieved, fertilized, and embryos are cultured in the laboratory for about five to six days until they reach the blastocyst stage. At this point, the embryologist can assess the embryo’s quality and, if PGT-A is planned, perform the biopsy.

    The biopsy is usually done on day 5 or day 6 after fertilization. After the biopsy, the embryos are frozen (vitrified) while the genetic analysis takes place. This means that the embryo transfer is delayed until the results are available, which is typically in a subsequent menstrual cycle.

    Therefore, the biopsy itself does not add significant time to the laboratory phase, but the wait for results does extend the overall timeline before a frozen embryo transfer can occur.

    How Long Do PGT-A Results Take?

    The time to receive PGT-A results varies depending on the testing method and the laboratory’s workflow. Some techniques, such as next-generation sequencing (NGS), may provide results in a few days, while others might take longer. In Thailand, many clinics send samples to specialized genetic laboratories, which may add shipping time.

    Typically, you can expect to wait anywhere from a few days to two weeks for results. Your clinic will give you a more specific estimate based on their protocols and the laboratory they use. It is important to ask about this timeline during your consultation so you can plan your stay or travel arrangements.

    Does PGT-A Add Time to the Overall IVF Cycle?

    Yes, PGT-A adds time to the overall IVF cycle, but not because of the biopsy itself. The main time addition is the delay between embryo biopsy and transfer, as you must wait for the genetic results. In a fresh embryo transfer cycle, the transfer would typically occur on day 5 or 6 after egg retrieval. With PGT-A, the transfer is postponed to a later cycle, usually after the results are available and the embryo has been frozen.

    This means that the total time from egg retrieval to embryo transfer can be extended by several weeks to a couple of months, depending on your clinic’s scheduling and your own menstrual cycle. However, many patients find that the benefit of knowing the chromosomal status of their embryos outweighs the additional wait.

    Planning Your IVF Cycle in Thailand with PGT-A

    If you are traveling to Thailand for IVF with PGT-A, it is essential to plan for the extended timeline. Here are some practical considerations:

    • Duration of stay: You may need to stay in Thailand for the initial monitoring, egg retrieval, and embryo biopsy, which typically takes about two to three weeks. After that, you can return home while waiting for results, and then come back for the frozen embryo transfer.
    • Communication: Ensure your clinic has a clear system for sharing results and scheduling your transfer, especially if you are not in the country.
    • Flexibility: Be prepared for potential delays, such as laboratory turnaround times or the need to repeat a cycle if no embryos are suitable for biopsy.

    Questions to Ask Your Clinic

    To get a clear picture of your timeline, ask your clinic the following questions:

    • On which day of embryo development do you typically perform the biopsy?
    • How long does the biopsy procedure take for a single embryo?
    • What is the expected turnaround time for PGT-A results?
    • Do you send samples to an external laboratory? If so, how does that affect the timeline?
    • How soon after receiving results can I schedule a frozen embryo transfer?
    • What is your policy for communicating results and coordinating with international patients?

    Next Steps: Your Checklist

    • Consult with your fertility specialist to determine if PGT-A is appropriate for your situation.
    • Ask for a detailed timeline that includes the biopsy and result wait.
    • Plan your travel and accommodation with flexibility for potential delays.
    • Discuss the costs of PGT-A, including biopsy, testing, and any additional shipping or storage fees.
    • Clarify how your embryos will be frozen and stored while awaiting results.

    Understanding the biopsy process and its impact on your IVF timeline can help you make informed decisions and reduce stress. While the wait for results can be anxious, it is a step that provides valuable information for your family-building journey.

    Frequently asked questions

    Is the PGT-A biopsy painful for the embryo?

    The embryo does not have nerves, so it does not feel pain. The biopsy removes a few cells from the outer layer, and the embryo continues to develop normally in the laboratory.

    Can PGT-A be done on day 3 embryos?

    While it is possible to biopsy embryos at the cleavage stage (day 3), it is more common and generally considered safer to biopsy at the blastocyst stage (day 5 or 6) because more cells can be removed without affecting the embryo's viability.

    Does PGT-A guarantee a successful pregnancy?

    No, PGT-A does not guarantee pregnancy or a healthy baby. It screens for chromosomal abnormalities, but it cannot detect all genetic conditions or ensure implantation. Many other factors affect the outcome.

    How long after PGT-A results can I have a frozen embryo transfer?

    The timing depends on your clinic's protocols and your own menstrual cycle. Typically, you may need to wait for your next cycle after receiving results, but your clinic will provide specific instructions.

    Continue your research

    Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.

  • Mosaic Embryo Results: What Information Should Patients Request?

    When you receive a mosaic embryo result, it means that the embryo contains a mixture of cells with normal and abnormal chromosome numbers. This finding can be confusing and emotionally challenging. The most important step is to gather clear, complete information from your clinic so you can discuss your options with a genetics professional. This guide outlines the key details you should request and the questions you should ask.

    At a Glance

    • Understand what a mosaic result means and its limitations.
    • Request the specific chromosome involved and the percentage of mosaicism.
    • Ask about the type of mosaicism and whether it is likely to affect embryo development.
    • Seek guidance on confirmatory testing and genetic counseling.
    • Discuss the clinical significance and your individual situation.

    Understanding Mosaic Embryo Results

    Mosaic embryos are identified through preimplantation genetic testing for aneuploidy (PGT-A). Unlike a uniformly normal (euploid) or uniformly abnormal (aneuploid) embryo, a mosaic embryo has a mix of cells. The result is often reported as a percentage, such as 20% or 50% mosaicism. However, the interpretation is complex and depends on the specific chromosome involved and the laboratory’s criteria.

    It is essential to understand that a mosaic result is not a diagnosis of a child’s health. It is a screening result that indicates a potential risk. Many mosaic embryos may not implant, may miscarry, or may lead to a healthy baby. The outcome depends on the type and extent of mosaicism.

    Key Information to Request from Your Clinic

    When you receive a mosaic result, ask your clinic for the following details:

    • Specific chromosome(s) involved: Which chromosome(s) show mosaicism? Some chromosomes are more likely to be associated with viable conditions than others.
    • Percentage of mosaicism: What proportion of cells were abnormal? This is often reported as a range or a specific percentage.
    • Type of mosaicism: Is it a single chromosome or multiple chromosomes? Is it a segmental (part of a chromosome) or whole-chromosome mosaicism?
    • Laboratory criteria: What thresholds does the lab use to classify an embryo as mosaic? Different labs have different cutoffs.
    • Quality of the embryo: What is the overall grade of the embryo? This may influence transfer decisions.
    • Recommendations for confirmatory testing: Does the clinic recommend additional testing, such as prenatal diagnosis (amniocentesis or CVS) if pregnancy occurs?

    Questions to Ask Your Genetics Counselor or Doctor

    Before your consultation, prepare a list of questions. Here are some important ones:

    • What is the clinical significance of this specific mosaic result?
    • What is the likelihood that the embryo will develop normally?
    • What are the risks of miscarriage or implantation failure?
    • If the embryo is transferred and pregnancy occurs, what prenatal testing is recommended?
    • Are there any known cases of healthy births with a similar mosaic pattern?
    • What are the alternatives to transferring this embryo?
    • How does this result affect my chances of a live birth?

    Understanding the Limitations of Mosaic Testing

    Mosaic testing is not perfect. The biopsy sample may not represent the entire embryo. A small number of cells are removed for testing, and the results may not reflect the true chromosomal status of the whole embryo. Additionally, some mosaic embryos may self-correct during development, leading to a normal baby. However, this is not guaranteed.

    It is also important to note that PGT-A is a screening test, not a diagnostic test. It cannot detect all genetic conditions, and a normal result does not guarantee a healthy baby.

    How to Prepare for Your Genetics Consultation

    To make the most of your consultation, gather all relevant records, including the full PGT report, embryo images, and any prior test results. Write down your questions and bring a trusted partner or friend for support. Ask for a clear explanation of the results in plain language, and request written materials if available.

    Consider asking about the experience of the genetics team and whether they have specific expertise in mosaic embryos. You may also want to ask about the clinic’s policy on transferring mosaic embryos, as some clinics have specific guidelines.

    Decision-Making Steps

    After you have all the information, you can weigh your options. Here is a step-by-step approach:

    1. Review the mosaic result details with your doctor.
    2. Seek a second opinion from a genetics specialist if needed.
    3. Discuss the risks and benefits of transferring the mosaic embryo versus other options, such as further IVF cycles or using a donor embryo.
    4. Consider the emotional and financial implications.
    5. Make a decision that aligns with your values and medical advice.

    Next Steps and Checklist

    • Request a copy of your full PGT report.
    • Schedule a genetics consultation.
    • Prepare a list of questions.
    • Ask about confirmatory testing options.
    • Discuss the timeline for decision-making.
    • Seek emotional support if needed.

    Remember, you are not alone. Many patients face this decision, and your medical team is there to guide you. Take your time and gather all the information you need.

    Frequently asked questions

    What does a mosaic embryo result mean?

    A mosaic embryo result means that the embryo has a mixture of cells with normal and abnormal chromosome numbers. It is a screening result, not a diagnosis, and the outcome can vary.

    What information should I ask for when I get a mosaic result?

    You should ask for the specific chromosome involved, the percentage of mosaicism, the type of mosaicism, the laboratory criteria, the embryo quality, and any recommendations for confirmatory testing.

    Can a mosaic embryo lead to a healthy baby?

    Yes, some mosaic embryos can lead to healthy babies, but the outcome depends on the specific mosaic pattern and other factors. Your doctor can provide more personalized information.

    Is PGT-A testing accurate for detecting mosaicism?

    PGT-A is a screening test and has limitations. The biopsy sample may not represent the entire embryo, and results may not always reflect the true chromosomal status. Confirmatory testing may be recommended if pregnancy occurs.

    Continue your research

    Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.

  • What Does a PGT-A Testing Quote Include in Thailand?

    Understanding Your PGT-A Quote in Thailand

    When you receive a quote for PGT-A (preimplantation genetic testing for aneuploidy) in Thailand, it should clearly outline the costs for the laboratory procedures involved. However, quotes can vary significantly between clinics, and understanding what is included—and what is not—is essential for accurate budgeting and comparison.

    This guide explains the typical components of a PGT-A quote, the factors that can affect the final price, and the questions you should ask before committing to a clinic.

    At a Glance: Key Components of a PGT-A Quote

    • Biopsy fee: Cost of removing a few cells from each embryo.
    • Genetic analysis fee: Cost of testing the biopsied cells for chromosomal abnormalities.
    • Embryology and laboratory fees: Costs for embryo handling, culture, and freezing.
    • Consultation and administrative fees: May be separate or bundled.
    • Additional costs: For embryo freezing, storage, shipping (if samples are sent abroad), and medications.

    What Typically Appears on a PGT-A Quote

    A detailed quote should itemize the services so you can see where your money goes. Here are the main line items you can expect:

    Biopsy Fee

    This covers the embryologist’s time and materials to remove a small number of cells (typically 3-5) from the trophectoderm (the part that becomes the placenta) of a day-5 or day-6 blastocyst. The biopsy is performed using a laser and a fine glass needle. This fee is usually charged per embryo.

    Genetic Analysis Fee

    This is the cost of the actual genetic test, which screens for an abnormal number of chromosomes (aneuploidy). The analysis may be performed in-house or at an external laboratory. If the clinic sends samples to an overseas lab, the quote may include shipping and handling fees.

    Embryology and Laboratory Fees

    These cover the general laboratory services required for embryo culture, grading, and preparation for biopsy. Some clinics bundle these into a single “lab fee,” while others charge separately.

    Consultation and Administrative Fees

    Initial consultations, follow-up appointments, and administrative paperwork may be billed separately. Some clinics include these in a package, while others charge per visit.

    What Might Be Excluded from the Quote

    Be aware that some costs are often not included in the initial quote. These can include:

    • Embryo freezing and storage: After biopsy, embryos are frozen while awaiting results. The initial freezing may be included, but ongoing storage is usually charged annually.
    • Medications: Fertility drugs for ovarian stimulation and any other prescribed medications are typically not part of the PGT-A quote.
    • Additional cycles: If no embryos are suitable for biopsy or if the cycle is canceled, you may incur costs for a new cycle.
    • Shipping and customs: If samples are sent to an international lab, shipping and customs fees may be added.
    • Genetic counseling: Some clinics recommend or require a session with a genetic counselor to discuss results, which may be an extra fee.

    Factors That Can Affect the Final Price

    Several variables can influence the total cost of PGT-A in Thailand:

    • Number of embryos tested: Most clinics charge per embryo, so the more embryos you have, the higher the total cost.
    • Type of testing: PGT-A is the most common, but some clinics may offer combined testing (e.g., PGT-A plus PGT-M for single-gene disorders), which will cost more.
    • In-house vs. external lab: In-house testing may be cheaper, but external labs may offer more comprehensive analysis.
    • Clinic location and reputation: Clinics in major cities or with high success rates may charge more.
    • Package deals: Some clinics offer packages that include IVF plus PGT-A, which can be more cost-effective than separate fees.

    Questions to Ask Before Comparing Quotes

    To make an informed comparison, ask each clinic the following questions:

    1. Is the biopsy fee included in the quote? If so, how many embryos does it cover?
    2. Is the genetic analysis fee per embryo or per cycle?
    3. Are there any additional laboratory or embryology fees not listed?
    4. Are consultation and follow-up appointments included?
    5. What is the cost of embryo freezing and storage for the first year?
    6. Are there any potential extra charges, such as for shipping or genetic counseling?
    7. What is the clinic’s policy if the cycle is canceled or no embryos are suitable for biopsy?
    8. Do you offer any package deals that include IVF and PGT-A?

    How to Compare Quotes Effectively

    When comparing quotes, look beyond the total price. Consider the following:

    • Transparency: A detailed quote is a good sign. Be wary of vague estimates.
    • Inclusions: Ensure you are comparing like-for-like. A higher quote may include more services.
    • Quality and experience: Research the clinic’s success rates and the embryologists’ experience with PGT-A.
    • Accreditation: Check if the clinic and its laboratory have relevant accreditations.

    Next Steps: Your Checklist

    • Request a detailed written quote from each clinic.
    • Ask the questions listed above to clarify what is included.
    • Factor in potential extra costs for medications, storage, and additional cycles.
    • Consider the clinic’s experience and success rates, not just the price.
    • Review the clinic’s policies on refunds or discounts if the cycle is canceled.

    By understanding the components of a PGT-A quote and asking the right questions, you can make a well-informed decision that fits your budget and needs.

    Frequently asked questions

    Is the biopsy fee usually included in a PGT-A quote?

    Many clinics include the biopsy fee in the PGT-A quote, but it may be listed separately. Always check whether the quote covers the biopsy procedure and how many embryos are included.

    Are there any hidden costs in a PGT-A quote?

    Potential extra costs include embryo freezing and storage, medications, shipping if samples are sent abroad, and genetic counseling. Ask the clinic for a full list of possible additional fees.

    Does the PGT-A quote include the IVF cycle costs?

    Typically, the PGT-A quote covers only the biopsy and genetic analysis. IVF cycle costs, including stimulation medications and egg retrieval, are usually separate. Some clinics offer packages that bundle these, so ask about package options.

    Can I negotiate the price of PGT-A testing in Thailand?

    Some clinics may offer package deals or discounts if you are testing multiple embryos. It is worth asking if there is any flexibility, but be cautious of clinics that significantly undercut standard prices, as quality may be compromised.

    Continue your research

    Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.

  • How to Interpret PGT-A Results: A Patient’s Guide

    If you are waiting for PGT-A results, you likely have questions about what the findings will mean for your IVF journey. This guide explains the types of results you may receive, how to interpret them, and what they might mean for your next steps. Remember, PGT-A is a screening tool, not a guarantee of pregnancy or a healthy baby. Your clinic will provide personalized advice based on your results and medical history.

    At a Glance: Key Points About PGT-A Results

    • PGT-A screens embryos for chromosomal abnormalities before transfer.
    • Results are typically reported as euploid, aneuploid, or mosaic.
    • Euploid embryos have the expected number of chromosomes and are usually prioritized for transfer.
    • Aneuploid embryos have missing or extra chromosomes and are generally not transferred.
    • Mosaic embryos have a mix of normal and abnormal cells; their transfer may be considered in certain situations.
    • PGT-A does not guarantee a successful pregnancy or a healthy baby.

    What Is PGT-A?

    Preimplantation Genetic Testing for Aneuploidy (PGT-A) is a test performed on embryos created through IVF. It checks for the correct number of chromosomes. Humans typically have 46 chromosomes in each cell. Having too many or too few chromosomes can lead to implantation failure, miscarriage, or genetic conditions such as Down syndrome.

    PGT-A is optional and not necessary for everyone. Your doctor may recommend it based on your age, medical history, or previous IVF outcomes. It is important to discuss the benefits, limitations, and costs with your clinic.

    Understanding Your PGT-A Results

    PGT-A results are usually reported as one of the following:

    Euploid

    A euploid embryo has the expected number of chromosomes (46). This is considered a normal result. Euploid embryos have the highest chance of implanting and developing into a healthy baby, but they do not guarantee a successful pregnancy. Other factors, such as embryo quality and uterine environment, also matter.

    Aneuploid

    An aneuploid embryo has missing or extra chromosomes. For example, trisomy 21 (three copies of chromosome 21) causes Down syndrome. Aneuploid embryos are generally not transferred because they are unlikely to result in a live birth and may cause miscarriage. Your clinic will discuss options, which may include discarding the embryo or, in some cases, using it for research (with your consent).

    Mosaic

    A mosaic embryo has a mixture of cells with normal chromosomes and cells with abnormal chromosomes. The percentage of abnormal cells is usually reported. Mosaic embryos may have a lower chance of implantation than euploid embryos, but some can still lead to a healthy baby. The decision to transfer a mosaic embryo is complex and depends on the specific chromosomes involved, the percentage of abnormal cells, and your personal circumstances. Your clinic may recommend genetic counseling to help you decide.

    What Do PGT-A Results Mean for Transfer Decisions?

    Your doctor will use your PGT-A results, along with other factors, to recommend which embryo(s) to transfer. Typically, euploid embryos are prioritized. If you have no euploid embryos, your doctor may discuss the option of transferring a mosaic embryo, but this is not always recommended. Aneuploid embryos are usually not transferred.

    It is important to understand that PGT-A does not test for all genetic conditions. It only screens for chromosomal abnormalities. Other genetic tests, such as PGT-M, are used for specific inherited diseases.

    Questions to Ask Your Clinic

    • What type of PGT test was performed on my embryos?
    • How are my results reported? What is the exact terminology?
    • What is the percentage of abnormal cells in a mosaic embryo, and which chromosomes are affected?
    • What are the success rates for transferring euploid versus mosaic embryos in my age group?
    • Are there any additional tests I should consider?
    • What are the costs associated with PGT and any follow-up testing?

    Next Steps After Receiving Your Results

    1. Schedule a consultation with your doctor to review your results in detail.
    2. Ask for a written copy of your results and any relevant reports.
    3. Discuss the implications for your transfer plan, including timing and number of embryos to transfer.
    4. If you have mosaic embryos, ask about genetic counseling to understand the risks and options.
    5. Consider your emotional well-being; waiting for results can be stressful. Seek support from your clinic or a counselor if needed.

    Limitations of PGT-A

    PGT-A is a powerful tool, but it has limitations. It cannot guarantee a successful pregnancy or a healthy baby. Embryos can be damaged during the biopsy process, although this is rare. Also, PGT-A may not detect all chromosomal abnormalities, and some embryos may be misclassified. The accuracy of the test depends on the laboratory and the technology used.

    Furthermore, PGT-A does not test for single-gene disorders (like cystic fibrosis) or structural rearrangements (like translocations). Those require PGT-M or PGT-SR, respectively. Your clinic can explain which tests are appropriate for your situation.

    Frequently Asked Questions

    What is the difference between PGT-A and PGT-M?

    PGT-A screens for chromosomal abnormalities (aneuploidy), while PGT-M tests for specific single-gene disorders that are inherited. PGT-M is used when one or both parents carry a known genetic mutation.

    Can a mosaic embryo result in a healthy baby?

    Yes, some mosaic embryos can lead to a healthy baby, but the chance is generally lower than with a euploid embryo. The outcome depends on the specific chromosomes involved and the percentage of abnormal cells. Your clinic can provide more personalized information.

    What if all my embryos are aneuploid?

    If all embryos are aneuploid, they are typically not transferred. Your doctor will discuss options, which may include a new IVF cycle, using donor eggs or sperm, or considering other family-building options. Genetic counseling can help you explore these choices.

    Is PGT-A mandatory for IVF?

    No, PGT-A is optional. It is not necessary for all patients. Your doctor may recommend it based on your age, medical history, or previous IVF outcomes. Discuss the pros and cons with your clinic to make an informed decision.

    How long does it take to get PGT-A results?

    The time to receive results varies by laboratory and the testing method used. Your clinic will provide an estimated timeline. Typically, results may take several days to a few weeks.

    Related Resources

    For more information about PGT in Thailand, visit our PGT in Thailand page. You can also explore our guides and FAQ sections for additional support.

    Frequently asked questions

    What is the difference between PGT-A and PGT-M?

    PGT-A screens for chromosomal abnormalities (aneuploidy), while PGT-M tests for specific single-gene disorders that are inherited. PGT-M is used when one or both parents carry a known genetic mutation.

    Can a mosaic embryo result in a healthy baby?

    Yes, some mosaic embryos can lead to a healthy baby, but the chance is generally lower than with a euploid embryo. The outcome depends on the specific chromosomes involved and the percentage of abnormal cells. Your clinic can provide more personalized information.

    What if all my embryos are aneuploid?

    If all embryos are aneuploid, they are typically not transferred. Your doctor will discuss options, which may include a new IVF cycle, using donor eggs or sperm, or considering other family-building options. Genetic counseling can help you explore these choices.

    Is PGT-A mandatory for IVF?

    No, PGT-A is optional. It is not necessary for all patients. Your doctor may recommend it based on your age, medical history, or previous IVF outcomes. Discuss the pros and cons with your clinic to make an informed decision.

    How long does it take to get PGT-A results?

    The time to receive results varies by laboratory and the testing method used. Your clinic will provide an estimated timeline. Typically, results may take several days to a few weeks.

    Continue your research

    Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.

  • Understanding PGT-A Success Rates in Thailand: What Patients Should Know

    PGT-A Success Rate in Thailand: What to Know

    If you are considering preimplantation genetic testing for aneuploidy (PGT-A) in Thailand, you likely want to know: what is the success rate? The short answer is that PGT-A does not guarantee a pregnancy or live birth, but it can help your doctor select embryos with the correct number of chromosomes, which may improve the chances of a successful transfer. However, success rates vary widely based on your age, embryo quality, and the clinic’s laboratory standards. This guide explains how to interpret success rates, what factors influence outcomes, and what questions to ask before starting treatment.

    At a Glance: Key Points About PGT-A Success

    • PGT-A screens embryos for chromosomal abnormalities (aneuploidy) before transfer.
    • Success is measured by live birth rate per transfer, not just pregnancy rate.
    • Your age and embryo quality are the biggest factors affecting success.
    • PGT-A does not guarantee a healthy baby; it may reduce the risk of miscarriage due to chromosomal issues.
    • In Thailand, success rates vary by clinic, so ask for their latest data.

    What Is PGT-A and How Does It Work?

    PGT-A is a genetic test performed on embryos created through IVF. A few cells are removed from the embryo (usually on day 5 or 6) and analyzed for chromosomal abnormalities. Embryos with the correct number of chromosomes (euploid) are considered viable for transfer, while those with missing or extra chromosomes (aneuploid) are usually not transferred because they often fail to implant or result in miscarriage.

    PGT-A is not the same as PGT-M (for single-gene disorders) or PGT-SR (for structural rearrangements). PGT-A only checks for chromosomal number abnormalities, not for specific genetic diseases.

    How Is Success Rate Measured?

    When clinics report success rates, they may use different metrics. The most meaningful is the live birth rate per transfer of a tested euploid embryo. Other metrics include:

    • Clinical pregnancy rate – presence of a gestational sac on ultrasound.
    • Ongoing pregnancy rate – pregnancy continuing past a certain gestational age.
    • Miscarriage rate – may be lower after PGT-A because aneuploid embryos are avoided.

    Be cautious when comparing numbers: a clinic may report pregnancy rates per egg retrieval, per embryo transfer, or per patient. Always ask for the exact definition.

    Factors That Influence PGT-A Success

    Maternal Age

    Age is a strong predictor of embryo aneuploidy. Women under 35 tend to have a higher proportion of euploid embryos, while women over 40 tend to have fewer. Therefore, the success rate of PGT-A may be higher in younger women simply because they have more normal embryos to transfer.

    Embryo Quality and Biopsy Timing

    Embryos that reach the blastocyst stage (day 5-6) are more likely to be viable. The biopsy technique and the number of cells removed can affect embryo survival. A skilled embryology team is crucial.

    Laboratory Standards

    The accuracy of PGT-A depends on the laboratory’s technology and quality control. In Thailand, some clinics use next-generation sequencing (NGS), which is considered highly accurate. However, there is always a small risk of a false positive or false negative result.

    Uterine Receptivity

    Even a genetically normal embryo may not implant if the uterine environment is not optimal. Factors like uterine fibroids, endometriosis, or hormonal imbalances can affect success.

    Interpreting Clinic Success Rates in Thailand

    When you look at a clinic’s success rates, consider the following:

    • Sample size – small numbers may not be statistically reliable.
    • Patient demographics – if the clinic treats many older patients, their overall success rate may be lower.
    • Transfer policy – some clinics transfer only one embryo at a time, which may lower pregnancy rate per transfer but reduce multiple births.
    • Time period – rates can change over time; ask for the most recent data.

    Remember that success rates are averages, not predictions for your individual case.

    Questions to Ask Your Clinic

    • What is your live birth rate per transfer of a PGT-A tested euploid embryo?
    • How many PGT-A cycles have you performed in the last year?
    • What genetic testing technology do you use (e.g., NGS)?
    • How do you handle embryos with mosaic results?
    • What is your policy on transferring embryos with uncertain results?
    • Can you provide success rates broken down by my age group?

    Next Steps: Making an Informed Decision

    1. Consult with a fertility specialist to assess whether PGT-A is appropriate for you.
    2. Ask for a detailed explanation of the testing process, including risks and limitations.
    3. Request the clinic’s success rates and compare them with national averages if available.
    4. Consider the cost of PGT-A and whether it fits your budget.
    5. Discuss the ethical and emotional aspects of embryo selection with your partner and counselor.

    PGT-A can be a valuable tool, but it is not a guarantee. By understanding the factors that influence success and asking the right questions, you can make a more informed choice about your fertility treatment in Thailand.

    Frequently asked questions

    Does PGT-A guarantee a successful pregnancy?

    No, PGT-A does not guarantee pregnancy or live birth. It helps select embryos with the correct number of chromosomes, which may reduce the risk of miscarriage and increase the chance of a successful transfer, but other factors like uterine receptivity and embryo quality also play a role.

    What is the success rate of PGT-A in Thailand?

    Success rates vary by clinic and patient age. There is no single national rate. Ask your clinic for their live birth rate per transfer of a PGT-A tested embryo, and compare it with data from other clinics.

    Is PGT-A worth the cost?

    PGT-A may be worth it for women over 35, those with recurrent miscarriage, or previous aneuploidy. It may reduce the number of failed transfers and miscarriages, but it adds cost to IVF. Discuss with your doctor whether it is likely to benefit you.

    Can PGT-A detect all genetic disorders?

    No, PGT-A only screens for chromosomal number abnormalities (aneuploidy). It does not detect single-gene disorders (PGT-M) or structural rearrangements (PGT-SR). If you have a specific genetic concern, ask about other tests.

    Continue your research

    Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.