IVF Daddies
Reference Platform
Decision Clarity System
Reference · IVF Daddies · v2026.3
What Is a Mosaic Embryo
Bottom line
A mosaic embryo contains both chromosomally normal and abnormal cells, detected through PGT-A testing. Low-level mosaic embryos can produce healthy pregnancies depending on the chromosome involved and the percentage of abnormal cells. Mosaic embryos are ranked below euploid embryos for transfer priority but are not automatically discarded.
Key Facts
- 1. Mosaicism is detected through PGT-A biopsy of blastocyst outer cells.
- 2. Approximately 15–20% of tested embryos receive a mosaic classification.
- 3. Mosaic embryos are ranked below euploid embryos for transfer priority.
- 4. Some mosaic embryos result in healthy, full-term pregnancies.
- 5. The decision to transfer depends on chromosomal level, segment involved, and the specific embryo's profile.
Example
A patient retrieves 8 eggs. Four fertilize. Two reach blastocyst. PGT-A shows one euploid, one mosaic. If the euploid embryo fails to implant, the mosaic embryo may be offered as a next-step transfer option after genetic counseling.
What This Does Not Mean
Mosaic does not mean the embryo will produce an abnormal child. It does not mean transfer should be automatic. The decision requires consultation with a reproductive geneticist and depends on the specific chromosomes involved.
Go deeper
This content explains system mechanics and definitions. It does not replace individualized clinical, legal, or financial guidance.