title: Serum and urinary markers of exogenous testosterone administration.
abstract: In an attempt to find optimal markers of exogenous testosterone (T) administration in male athletes, a number of compounds were measured in 11 healthy men before and after 3, 6 and 9 months of weekly administration of 250 mg i.m. T enanthate and in age-matched untreated controls. The following variables were measured in serum: T, 17 alpha-hydroxyprogesterone (17-OHP), sex hormone-binding globulin (SHBG), estradiol-17 beta, estrone (free + conjugated) and luteinizing hormone (LH). The following variables were measured in urine: T glucuronide (urinary T), epitestosterone glucuronide (urinary epiT), estrone (free + conjugated) and LH. Serum T, serum T/17-OHP ratio, serum T/LH ratio, serum T/SHBG ratio, serum and urinary estrogens, urinary T/creatinine-, T/epiT- and T/LH ratios increased whereas serum 17-OHP, SHBG and LH and urinary epiT/creatinine- and LH/creatinine-ratios decreased significantly during treatment. Levels above the upper reference limit were found in all subjects at 3, 6 and 9 months for serum T/17-OHP and serum and urinary T/LH ratios and at 6 months for the urinary T/epiT ratio. Levels below the lower reference limit were found in all subjects at 3, 6 and 9 months for serum LH and the urinary LH/creatinine ratio, at 3 months for the urinary epiT/creatinine ratio and at 9 months for serum 17-OHP. No other variable showed abnormal values in all subjects at the same occasion. Despite significant changes during treatment, steroid concentrations as such are poor indicators of T doping. Serum and urinary LH levels, T/LH ratios and serum T/17-OHP ratios seem to be the most reliable markers of exogenous T administration in males.
authors.affiliation: Department of Clinical Chemistry, Karolinska Institutet, Huddinge University Hospital, Sweden.
authors.forename: E
authors.initials: E
authors.lastname: Palonek
authors.forename: C
authors.initials: C
authors.lastname: Gottlieb
authors.forename: M
authors.initials: M
authors.lastname: Garle
authors.forename: I
authors.initials: I
authors.lastname: Björkhem
authors.forename: K
authors.initials: K
authors.lastname: Carlström
mesh_terms: D000367:Age Factors; D015415:Biomarkers / Q000032:analysis; D003401:Creatine / Q000652:urine; D004958:Estradiol / Q000097:blood; D004970:Estrone / Q000097:blood / Q000652:urine; D006801:Humans; D006908:Hydroxyprogesterones / Q000097:blood* / Q000652:urine*; D007986:Luteinizing Hormone / Q000097:blood / Q000652:urine; D008297:Male; D016555:Matched-Pair Analysis; D012738:Sex Hormone-Binding Globulin / Q000032:analysis; D013739:Testosterone / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000097:blood* / Q000652:urine*
chemical_list: D015415:Biomarkers; D006908:Hydroxyprogesterones; D012738:Sex Hormone-Binding Globulin; C015529:testosterone glucuronate; D004970:Estrone; D013739:Testosterone; D004958:Estradiol; C004648:testosterone enanthate; D007986:Luteinizing Hormone; D003401:Creatine