Eggs, sperm & embryos
Blastocyst grading scores the inner cell mass and the trophectoderm separately, alongside how expanded the blastocoel is. Grades describe appearance, not chromosomes, so a top-grade embryo can still be aneuploid.
Also known as: ICM
Related Canada guides
Sources
- Canadian Fertility and Andrology Society (CFAS)
Last reviewed: September 9, 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.