Eggs, sperm & embryos
Extrusion of the first polar body marks maturity; a second appears after fertilisation. Embryologists use polar bodies as visual markers when assessing eggs and confirming fertilisation.
Also known as: first polar body
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.