morphology assessment
Microscopic evaluation of embryo development and structure. Critical for selecting the best embryos for transfer.
Full Definition
Morphology assessment is the detailed microscopic evaluation of embryo development, structure, and quality at various stages of development. This assessment examines factors such as cell number, symmetry, fragmentation, and overall appearance to predict implantation potential. Traditional morphology grading systems evaluate embryos on day 3 (cleavage stage) and day 5-6 (blastocyst stage) using standardized criteria. Day 3 assessment focuses on cell number, fragmentation percentage, and symmetry, while blastocyst assessment evaluates expansion grade, inner cell mass quality, and trophectoderm appearance. Morphology assessment guides embryo selection for transfer and cryopreservation decisions. While morphology assessment remains the primary method for embryo selection, it may be supplemented by advanced techniques such as preimplantation genetic testing or time-lapse imaging.
Usage
Usage note: Ensure consistency in grading terminology; different laboratories may use varying classification systems.
In Context
- "Morphology assessment identified two grade AA blastocysts suitable for single embryo transfer." — Embryology report
- "Day 3 morphology assessment showed excellent embryo quality with minimal fragmentation." — Culture progress notes