Embryology
Cleavage-stage embryos (day 2 and day 3) are assessed by cell number, evenness and fragmentation. Some are transferred or frozen at this stage.
Also known as: cleavage embryo
Related United Kingdom guides
Sources
Last reviewed: 23 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.