What Grade Will Your Embryos Earn?

Embryos are judged by looking at certain characteristics including the number and size of the cells, the rate of development, symmetry, inner cell mass, and other factors such as fragmentation where there is debris between cells. Grading systems can assign letter grades and/or numeric points. Grading also depends on the stage of development. It can occur on Day 3 at the cleavage stage when cells are dividing, or on Day 5, at the blastocyst stage after fertilization when there’s an inner cell mass.