A woman with secondary amenorrhea, negative pregnancy test, progesterone withdrawal bleed, normal FSH, and low LH most likely has which condition?

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Multiple Choice

A woman with secondary amenorrhea, negative pregnancy test, progesterone withdrawal bleed, normal FSH, and low LH most likely has which condition?

The main idea is that a withdrawal bleed after a progesterone challenge means there is enough estrogen and a normal uterine lining, so the problem lies with ovulation rather than estrogen production or an outflow issue. In this scenario, the pituitary-hypothalamic axis is driving the pattern: low LH with normal FSH points toward a disruption that preferentially lowers LH, commonly from hyperprolactinemia caused by hypothyroidism. Thyroid deficiency raises TRH, which stimulates prolactin release; elevated prolactin suppresses GnRH, reducing LH (and often FSH) and leading to anovulatory cycles and secondary amenorrhea. Because estrogen is present, the endometrium can proliferate enough to allow a withdrawal bleed when progesterone is withdrawn, even though ovulation isn’t occurring. This helps distinguish from ovarian failure, where estrogen would be low and there would typically be no withdrawal bleed after progesterone; from PCOS, where LH is usually elevated relative to FSH and hyperandrogenism is present; and from a prolactinoma, where prolactin would be elevated and GnRH suppression would generally lower both LH and FSH more markedly.

The main idea is that a withdrawal bleed after a progesterone challenge means there is enough estrogen and a normal uterine lining, so the problem lies with ovulation rather than estrogen production or an outflow issue. In this scenario, the pituitary-hypothalamic axis is driving the pattern: low LH with normal FSH points toward a disruption that preferentially lowers LH, commonly from hyperprolactinemia caused by hypothyroidism. Thyroid deficiency raises TRH, which stimulates prolactin release; elevated prolactin suppresses GnRH, reducing LH (and often FSH) and leading to anovulatory cycles and secondary amenorrhea. Because estrogen is present, the endometrium can proliferate enough to allow a withdrawal bleed when progesterone is withdrawn, even though ovulation isn’t occurring.

This helps distinguish from ovarian failure, where estrogen would be low and there would typically be no withdrawal bleed after progesterone; from PCOS, where LH is usually elevated relative to FSH and hyperandrogenism is present; and from a prolactinoma, where prolactin would be elevated and GnRH suppression would generally lower both LH and FSH more markedly.

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