Eggs, sperm & embryos
2PN describes the appearance of two small circles inside the egg on the morning after insemination, each containing genetic material from one parent. Seeing 2PN is how laboratories confirm normal fertilisation before the embryo starts dividing.
Also known as: 2PN, pronuclei, PN check
Related South Africa guides
Sources
- ESHRE/ICMART glossary and ESHRE laboratory guidance
Last reviewed: 8 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.