δ13 C values of urinary 19-norandrosterone in antidoping samples and potential for adverse findings from boar offal consumption.
Drug testing and analysis(2023)
Abstract
19-Norandrosterone (19NA) is the preferred urinary target compound to identify doping with nandrolone or related 19-norsteroids. At concentrations between 2.5 and 15 ng/mL, isotope ratio mass spectrometry (IRMS) is required to establish exogenous origin of urinary 19NA. An absolute difference of 3‰ between urinary 19NA and an endogenous reference compound (ERC) constitutes a finding for exogenous origin of 19NA. Over the last 3 years, 77 samples containing urinary 19NA between 2.5 and 15 ng/mL were analyzed at our laboratory. The measured δ
1313
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Key words
19-norandrosterone,carbon isotope ratio,offal
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