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Fertility Glossary

GnRH agonist

A medicine that first stimulates and then suppresses the body's own hormones.

Used in long protocols to prevent early ovulation, and sometimes as a trigger injection in people at high risk of overstimulation.

Related terms

GnRH antagonist

A medicine that quickly blocks the hormone surge causing early ovulation.

Trigger injection

An injection that matures the eggs and sets the timing for collection or insemination.

Ovarian stimulation

Injections used to grow several follicles at once.

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