Treatment
The trigger is given at a precise time, usually about 36 hours before egg collection, to complete egg maturation. It is either hCG-based or a GnRH agonist, with the agonist preferred when OHSS risk is high. Timing matters — a trigger given late or missed can mean no eggs are collected.
Also known as: trigger shot, hCG trigger, ovitrelle
Related Australia guides
Related checklists
Sources
- Royal Australian and New Zealand College of Obstetricians and Gynaecologists (ranzcog.edu.au)
Last reviewed: 10 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.