Fertility Glossary

Antagonist protocol

A short IVF stimulation protocol using GnRH antagonists.

The antagonist protocol uses medications that block premature ovulation during stimulation. It is the most widely used IVF protocol in US clinics and allows a wider choice of trigger medication.

Related terms

Stimulation

The injectable phase of IVF that grows multiple follicles.

Trigger shot

The injection that matures eggs before retrieval.

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