IVF Daddies
Reference Platform
Decision Clarity System
Reference · IVF Daddies · v2026.3
What Is PGT-A
Bottom line
PGT-A screens IVF embryos for chromosomal abnormalities before transfer. Embryos are classified as euploid (normal chromosomes, highest implantation chance), aneuploid (abnormal, not transferred), or mosaic (mixed, case-by-case decision). PGT-A reduces per-transfer miscarriage rates but does not increase the total number of viable embryos from a retrieval cycle.
Key Facts
- 1. A small biopsy is taken from the outer cells of a blastocyst embryo.
- 2. Results classify embryos as euploid (normal), aneuploid (abnormal), or mosaic.
- 3. Only euploid embryos are typically transferred first.
- 4. PGT-A increases per-transfer success but does not increase total embryo supply.
- 5. Mosaic embryos are not automatically discarded. Some result in healthy pregnancies.
Euploid vs. Aneuploid vs. Mosaic
Euploid
The correct number of chromosomes (46). These embryos are selected for transfer first.
Aneuploid
Abnormal chromosome count. Higher miscarriage risk. Most clinics do not transfer aneuploid embryos.
Mosaic
A mix of normal and abnormal cells. Classification is debated. Some mosaic embryos result in healthy births.
What This Does Not Mean
PGT-A does not guarantee a successful pregnancy. An euploid embryo can still fail to implant. A mosaic embryo is not necessarily non-viable. The test reduces uncertainty. It does not eliminate it.
Go deeper
This content explains system mechanics and definitions. It does not replace individualized clinical, legal, or financial guidance.