Velo Vortmax blasts WADA for its resistance to change in the face of additional new evidence that the testosterone:epitestosterone ratio test is flawed (“Genetic variations in enzyme UGT2B17: Implications,” April 3).

WADA refuses to worry about trivial genetic factors. WADA is loath to do longitudinal tests of athletes. WADA might find a variable that might refute their laboratory findings or challenge their presumption of laboratory perfection. WADA would never invest time and money doing pedigree studies to determine if a single metabolite above threshold for exogenous testosterone is a trait common in a family, or among a group of people found in a geographical region. But idiosyncratic individual differences in medicine have been documented in many pedigree studies. For example, hematocrit levels above 50% have been found in fathers and sons of elite cyclists. These hematocirt levels are inherited tendencies, not based on EPO doping. The same is true for testosterone/epitestosterone ratio(s) and may be true for Carbon Isotope metabolite delta/delta scores.

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