Steroid Changes During the Menstrual Cycle of the Baboon (Papio cynocephalus) and Human

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Abstract
Nine serum steroids were simultaneously measured by radioimmunoassay following celite chromatography during a complete menstrual cycle of 5 normally cycling baboon (Papio cynocephalus) and human females. Statistical evaluation by analysis of variance using the lognormal distribution of all steroid measurements indicates significant variation among cycle days for estrone, estradiol, progesterone, 17α-hydroxyprogesterone, testosterone and androstenedione. No overall cyclic variation was observed for serum levels of dihydrotestosterone, dehydroepiandrosterone and cortisol in either species.