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Fertility Glossary

Two pronuclei (2PN)

The sign of normal fertilisation checked the day after egg collection.

Embryology

A 2PN egg has one pronucleus from the egg and one from the sperm. Embryologists count 2PN eggs when calling with your fertilisation results.

Also known as: 2PN, 2 PN

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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.

Related terms

Pronucleus

The nucleus from the egg or the sperm visible after fertilisation.

Normal fertilisation

Fertilisation producing an egg with two pronuclei.

Abnormal fertilisation

Fertilisation with an unexpected number of pronuclei, such as one or three.

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