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Urinary excretion rates of 15 free steroids: potential utility in differential diagnosis of Cushing's syndrome.

To evaluate their potential usefulness in the differential diagnosis of Cushing's syndrome, we estimated the urinary excretion rates of the following non-metabolized, unbound steroid hormones: pregnenolone, progesterone, 17-OH-pregnenolone, 17-OH-progesterone, dehydroepiandrosterone (DHEA), androstenedione, testosterone, dihydrotestosterone, 11-deoxycorticosterone, 11-deoxycortisol, corticosterone, cortisol, 18-OH-11-deoxycorticosterone, 18-OH-corticosterone, and aldosterone. These were measured in normal subjects and in patients with Cushing's disease, adrenal adenoma, or ectopic corticotropin syndrome. We used "high-performance" liquid chromatography and subsequent radioimmunoassay. Our results indicate that simultaneous estimation of urinary free cortisol and DHEA may be useful in differential diagnosis of hypercorticoid states due to adrenal adenoma and Cushing's disease.