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Information on biological day-to-day variation is needed for detecting within-subject changes over time. In this study the daytime changes and the biological day-to-day variation of serum testosterone, follitropin, lutropin and oestradiol-17β concentrations were investigated in 31 healthy males.

Biological Day-to-Day Variation and Daytime Changes of Testosterone, Follitropin, Lutropin and Oestradiol-17β in Healthy Men