Understanding PGT-A results: euploid, aneuploid, mosaic and no result

PGT-A reports can look definitive while still requiring careful interpretation. Result labels describe the tested sample and laboratory analysis; they are not a complete prediction of pregnancy or child health.

Common categories

A euploid result is consistent with the expected chromosome number in the sampled cells. An aneuploid result indicates a chromosome-number finding. A mosaic result suggests a mixture of cell findings, and a no-result report means the laboratory could not issue a conclusive result from that sample.

Why clinic policy matters

Clinics and laboratories may differ in reporting thresholds, terminology, re-biopsy policies and the circumstances in which mosaic embryo transfer is considered. Ask for the written policy before testing whenever possible.

Counselling questions

Complex results deserve a conversation with qualified professionals.

  • Which laboratory performed the test?
  • What platform and reporting thresholds were used?
  • How are segmental and mosaic findings reported?
  • What are the options for no-result embryos?
  • Is genetic counselling available before a transfer decision?

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