Alla hormoner har förändringar i sina nivåer över dygnet. Testosterontopparna, t ex:
Citat:
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In healthy young subjects, the mean Cnadir, Cpeak, Tnadir, and Tpeak values estimated from the model were 420 ng/dL, 577 ng/dL, 21:42 hours, and 0600 hours, respectively, and were similar to the parameters obtained for the frequently sampled young subjects.
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J Clin Pharmacol. 2000 Jul;40(7):731-8.