Cleavage Stage Embryo
embryologyDefinition
An embryo on Day 2-3 of development, typically having 4-8 cells. Earlier IVF transfers used cleavage stage embryos, though blastocyst culture is now more common.
In IVF Treatment
Some clinics or situations may still involve Day 3 transfers, particularly with few embryos or very slow-developing ones. Day 3 embryo quality is assessed by cell number, fragmentation, and symmetry.