Laboratory testing should include measurement of testosterone, sex hormone binding globulin (SHBG), gonadotropins, estradiol, androstenedione, dehydroepiandrosterone sulfate (DHEA-S), and 17-OH-progesterone values, as well as markers of other endocrine disorders leading to secondary hyperandrogenism, especially Cushing's syndrome. The gene discussed is SHBG; the disease is Cushing syndrome due to macronodular adrenal hyperplasia.