Table I.

— Cleavage stage embryo scoring (day 3) (from Veeck, 1991).

Grade	Description
Grade 1	Embryo with blastomeres of equal size, no cytoplasmic fragments
Grade 2	Embryo with blastomeres of equal size, minor cytoplasmic fragments or blebs
Grade 3	Embryo with blastomeres of distinctly unequal size, none or few cytoplasmic fragments
Grade 4	Embryo with blastomeres of equal or unequal size, signi cant cytoplasmic fragmentation
Grade 5	Embryo with few blastomeres of any size, severe or complete fragmentation