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The rapid postpartum return of gonadotropic function during bromocriptine treatment was investigated through hormonal measurements in 15 women. Luteinizing hormone (LH) was measured by a novel and specific assay that does not cross-react with human chorionic gonadotropin (hCG). Prolactin was effectively suppressed by bromocriptine and hCG was cleared within 2 weeks. During the first week, both follicle-stimulating hormone (FSH) and LH were undetectable. The return of FSH and LH secretion occurred in the second postpartum week and initially was characterized by a high FSH/LH ratio. The causes of the 1-week delay in resumption of pituitary gonadotropin secretion are not known, but endogenous opioids may play a role. The possible relation between the high FSH/LH ratio and low LH pulse frequency also is discussed.
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