Serum androgen and gonadotropin levels decline after progestogen-induced withdrawal bleeding in oligomenorrheic women with or without polycystic ovaries.

OBJECTIVE: To examine the effect of short-term progestogen treatment on androgen, gonadotropin, and sex hormone-binding globulin (SHBG) levels in oligomenorrheic women. DESIGN: Comparative study of changes in hormonal parameters in patients with or without ultrasonographically diagnosed polycystic ovarian disease (PCOD). SETTING: Open patient clinic of reproductive endocrinology at University Central Hospital of Turku, Finland. PATIENTS: Seventy-five oligomenorrheic women with (n = 51) or without (n = 24) PCOD. MAIN OUTCOME MEASURES: Serum concentrations of testosterone (T), androstenedione (A), dehydroepiandrosterone sulfate, luteinizing hormone (LH), follicle-stimulating hormone (FSH), and SHBG. RESULTS: The levels of T, A, LH, and the LH:FSH ratios decreased significantly after oral treatment with medroxyprogesterone acetate (10 mg/d for 10 days) in non-PCOD women and in women with PCOD decreasing the frequencies of pathological laboratory findings, in particular elevated levels of LH:FSH ratio and A in PCOD women and of LH:FSH ratio in non-PCOD women. The levels of T, A, and LH as well as the LH:FSH ratio were significantly higher in women with PCOD. Obesity was associated with high free androgen indices, low LH:FSH ratios, and low concentrations of LH, A, and SHBG. CONCLUSIONS: The serum samples for hormonal analyses used as an aid in diagnosing PCOD should be obtained without pretreatment with progestogen because it masks the biochemical findings of PCOD.