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1 Introduction Serum testosterone (T), androstenedione (A4), and the T/A4 ratio have been shown to be more sensitive biomarkers than the urinary T/epitestosterone (T/E) ratio to detect low-dose T administration in women, particularly if monitored in the serum steroid module of the Athlete Biological Passport (ABP) [1]. Overall, the intra-individual variation of these serum markers exhibited lower variation compared to traditional urinary steroids [2].
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