Reporting and managing elevated testosterone/epitestosterone ratios--novel aspects after five years' experience

Reporting and managing elevated testosterone / epitestosterone ratios--novel aspects after five years' experience / Ute Mareck, Hans Geyer, Gregor Fußhöller, Anne Schwenke, Nadine Haenelt, Thomas Piper, Mario Thevis, Wilhelm Schänzer. - (Drug Testing and Analysis 2 (2010) 11-12 (November) ; p. 637-642).

  • PMID: 21204295
  • DOI: 10.1002/dta.234

Abstract:

The testosterone/epitestosterone (T/E) ratio was implemented as an indirect parameter for the detection of testosterone administration with an empirically established threshold value at T/E = 6. In 2005, the T/E reporting threshold was lowered from six to four.

Between 2005 and 2009, 63 510 doping control urine samples were analyzed in the Cologne laboratory. A total of 1442 specimens (2.3%) showed a T/E > 4; 80 (5.5%) of which were tested positive by means of isotope ratio mass spectrometry (IRMS); and most of which (68) originated from strength sport disciplines.

Specimens of high T/E ratio showed a much higher probability for being confirmed to contain exogenous testosterone using IRMS analysis than samples of low T/E values.

Considering the small number of adverse analytical findings triggered by lowering the T/E reporting threshold (978 urine specimens with T/E ratios between 4 and 6 yielded only 4 (0.4%) positive IRMS findings) and the known limitations of the T/E ratio as discriminating parameter (UGT2B17 polymorphism), the currently mandatory approach shows only marginal overall efficiency.

A more effective tool for the detection of the misuse of testosterone would be the implementation of individual reference ranges. Until athlete steroidal passports are available, it is suggested to exceed the threshold level for T/E from 4 to 6 and perform obligatory IRMS analysis for specimens showing T/E > 6. Further conditions triggering IRMS analysis could be suppressed luteinizing hormone (LH) values in males and disproportionate changes of relevant parameters in individual profiles evidently not resulting from ethanol consumption.

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Science
Review
Date
1 November 2010
People
Fußhöller, Gregor
Geyer, Hans
Haenelt, Nadine
Mareck, Ute
Piper, Thomas
Schänzer, Wilhelm
Schwenke, Anne
Country
Germany
Language
English
Laboratories
Cologne, Germany: Institute of Biochemistry - German Sport University Cologne
Analytical aspects
Mass spectrometry analysis
Metabolization
Doping classes
S1. Anabolic Agents
Substances
Epitestosterone
T/E ratio (testosterone / epitestosterone)
Testosterone
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14 December 2011
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12 November 2020
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