embryo morphology grading
Systematic assessment of embryo appearance and developmental features for selection in assisted reproduction.
Full Definition
Embryo morphology grading is a standardized system used in assisted reproductive technology to evaluate and rank embryos based on their microscopic appearance and developmental characteristics. This assessment considers factors such as cell number, symmetry, fragmentation, multinucleation, and overall developmental stage appropriate for the culture day. In reproductive genetics, morphology grading is often combined with genetic testing results to optimize embryo selection for transfer, though it's important to note that morphologically normal embryos can still carry genetic abnormalities.
Usage
Usage note: Specific grading systems may vary between laboratories; always specify the system used.
In Context
- "The embryo morphology grading system classified the day-3 embryo as Grade A with 8 cells and minimal fragmentation." — IVF laboratory report
- "Despite excellent embryo morphology grading, genetic testing revealed chromosomal abnormalities." — PGT cycle summary