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Detection of dehydroepiandrosterone misuse by means of gas
chromatography-combustion-isotope ratio mass spectrometry Ute Mareck,* Hans Geyer, Ulrich Flenker, Thomas Piper, Mario Thevis and Wilhelm
Schänzer Institute of Biochemistry, German Sport University Cologne, Carl-Diem Weg 6, 50933 Cologne, Germany. E-mail: u.mareck@biochem.dshs-koeln.de
ABSTRACT:
According to World Anti-Doping Agency (WADA) rules (WADA Technical Document—TD2004EAAS) urine samples containing dehydroepiandrosterone (DHEA)
concentrations greater than 100 ng ML–1 shall be submitted to isotope ratio mass spectrometry (IRMS) analysis. The threshold concentration is based on the
equivalent to the glucuronide, and the DHEA concentrations have to be adjusted for a specific gravity value of 1.020. In 2006, 11,012 doping control urine samples from national
and international federations were analyzed in the Cologne doping control laboratory, 100 (0.9%) of them yielding concentrations of DHEA greater than 100 ng
mL–1. Sixty-eight percent of the specimens showed specific gravity values higher than 1.020, 52% originated from soccer players, 95% were taken in
competition, 85% were male urines, 99% of the IRMS results did not indicate an application of testosterone or related prohormones. Only one urine sample was reported as an
adverse analytical finding having 319 ng mL–1 DHEA (screening result), more than 10,000 ng mL–1 androsterone and depleted carbon
isotope ratio values for the testosterone metabolites androsterone and etiocholanolone. Statistical evaluation showed significantly different DHEA concentrations between
specimens taken in- and out-of-competition, whereas females showed smaller DHEA values than males for both types of control. Also a strong influence of the DHEA excretion on
different sport disciplines was detectable. The highest DHEA values were detected for game sports (soccer, basketball, handball, ice hockey), followed by boxing and wrestling. In
2007, 6622 doping control urine samples were analyzed for 3α,5-cyclo-5α-androstan-6β-ol-17-one (3α,5-cyclo), a DHEA metabolite which was
described as a useful gas chromatography-mass spectrometry (GC-MS) screening marker for DHEA abuse. Nineteen urine specimens showed concentrations higher than the
suggested threshold of 140 ng mL–1, six urine samples yielded additionally DHEA concentrations higher than 100 ng mL–1, none of
them showing positive IRMS findings. These results should be taken into consideration in future discussions about threshold values for endogenous steroids in doping control.
Keywords:
sport, doping, urine, steroid profile, endogenous steroids, DHEA, isotope ratio mass spectrometry, metabolism
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