Epitestosterone is well known that the use of testosterone to improve athletic performance, is prohibited in sport. To disclose such abuse in any sport or sports, urine tests were confirmed. prepared 1: In normal healthy individuals, testosterone: epitestosterone (T: E) ratio of Figure 1. Thus, it is assumed that the urine-T: E ratio increases among athletes take exogenous compounds contains testosterone. According to the guidelines of the World Anti-Doping Agency in 2004, when an athlete has a urine-T: E ratio> 4: 1, he / she consumed an excessive amount of substance is regarded as testosterone and that containing a sample urine or the isotope ratio mass spectrometry ratio (IRMS) is presented for determining the 13C / 12C ratio. The IRMS test on urine samples to confirm the illegal use of a prohibited substance in a position, as exogenous compounds less 13C than 12C its endogenous counterpart.
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