IVF & IUI
Premature ovulation is when the LH surge happens before the planned egg collection, so the eggs are released and cannot be retrieved. GnRH agonists and antagonists are used specifically to prevent this, and it is one reason the trigger injection must be given at the exact time instructed.
Also known as: early ovulation, ovulated before collection
Related South Africa guides
Sources
- ESHRE guidelines and patient information
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.