What is the purpose of the GnRH antagonist in IVF protocols?

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Multiple Choice

What is the purpose of the GnRH antagonist in IVF protocols?

The purpose of a GnRH antagonist in IVF protocols is to prevent a premature LH surge during controlled ovarian stimulation. When gonadotropins are used to mature multiple follicles, the pituitary can still release LH, and an early LH surge would trigger ovulation before the eggs can be retrieved, compromising the cycle. The antagonist immediately blocks GnRH receptors in the pituitary, rapidly suppressing LH (and FSH) release so ovulation is delayed until the clinician is ready to trigger and retrieve the eggs. This approach provides a quick, reversible suppression without the initial flare seen with GnRH agonists, and it helps maintain follicular development under controlled timing. It does not stimulate ovulation, increase estrogen production, or trigger the luteal phase.

The purpose of a GnRH antagonist in IVF protocols is to prevent a premature LH surge during controlled ovarian stimulation. When gonadotropins are used to mature multiple follicles, the pituitary can still release LH, and an early LH surge would trigger ovulation before the eggs can be retrieved, compromising the cycle. The antagonist immediately blocks GnRH receptors in the pituitary, rapidly suppressing LH (and FSH) release so ovulation is delayed until the clinician is ready to trigger and retrieve the eggs. This approach provides a quick, reversible suppression without the initial flare seen with GnRH agonists, and it helps maintain follicular development under controlled timing. It does not stimulate ovulation, increase estrogen production, or trigger the luteal phase.

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