Evaluation of serum antimullerian hormone and inhibin B concentrations in the differential diagnosis of secondary oligoamenorrhea.

OBJECTIVE To evaluate the performance of antimullerian hormone (AMH) and inhibin B as ovarian function markers for differentiating common causes of secondary oligoamenorrhea, namely hypogonadotrophic hypogonadism (HH), polycystic ovary syndrome (PCOS), premature ovarian failure (POF), and hyperprolactinemia (HPRL). DESIGN Retrospective analysis. SETTING Two university hospitals. PATIENT(S) A total of 124 women with secondary oligoamenorrhea and 26 women with normal ovulation. INTERVENTION(S) Serum samples from the subjects were analyzed for AMH and inhibin B. MAIN OUTCOME MEASURE(S) Serum AMH and inhibin B concentrations. RESULT(S) Serum AMH concentration was significantly raised in women having World Health Organization group 2 anovulation, either with or without PCOS, and was significantly decreased to very low levels in POF; the diagnostic accuracy in both conditions was excellent, with areas under the receiver operating characteristic curve (AUC) of 0.913 and 0.977, respectively. The discriminatory performance between HH and PCOS was also good, with AUC 0.861. AMH remained unchanged in HH and HPRL compared with ovulatory control subjects. There were large overlap of serum inhibin B levels in the different conditions, and a significant difference from control subjects existed only in the POF group. CONCLUSION(S) Serum AMH, but not inhibin B concentration, serves as a useful diagnostic tool in the differential diagnosis of secondary oligoamenorrhea.