Eggs, sperm & embryos
Seeing two pronuclei — one from the egg, one from the sperm — confirms normal fertilisation. One or three pronuclei indicate abnormal fertilisation, and those zygotes are not used for transfer.
Also known as: 2PN, fertilisation check
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.