Serum testosterone concentrations in the evaluation of androgen-producing tumors.

During a 5-year study period 18 women with a serum testosterone concentrations of greater than 2 ng/ml were evaluated for a possible androgen-producing tumor. All subjects were hirsute and had menstrual irregularities, with the exception of one postmenopausal woman. The majority of the women were obese and 72% were greater than 50% over ideal body weight. Only two of 11 women undergoing operative and histologic evaluation of the ovaries were found to have an androgen-producing neoplasm. Seven additional women with serum testosterone concentration of greater than 2 ng/ml have been followed for over 1 year with no additional evidence of an androgen-producing neoplasm. The poor predictive value of a serum concentration of greater than 2 ng/ml in identification of an androgen-producing neoplasm is partially explained by the apparent prevalence of high testosterone concentrations in chronically anovulatory, hyperandrogenic obese women and by the large coefficient of variation observed in this study when analyzing testosterone concentrations were analyzed over an 8-hour interval (range, 3% to 42%). In the absence of an adnexal mass or rapidly progressive virilization, it is suggested that the use of venography or operative exploration to diagnose an androgen-producing neoplasm be reserved for women with a mean testosterone concentration derived from three daily samples that is at least 2.5 times greater than the upper range of normal in the given laboratory.