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• W2078130169 abstract "Conjugated norandrosterone is the main urinary metabolite of anabolic steroids like nandrolone, norandrostenedione and norandrostenediol. Nandrolone traces of endogenous origin have been identified in human follicular fluid, and further investigations revealed urinary excretion of norandrosterone in pregnant and non-pregnant females and even males. A threshold level for the norandrosterone concentration in urine has been established when controlling the administration of prohibited nandrolone or its precursors in human doping control. This level has been set to 2 ng/mL for males and females. To investigate the excretion of conjugated norandrosterone in females more systematically, we collected daily urine samples from 12 female volunteers during a whole menstrual cycle. These samples were analysed for norandrosterone down to a limit of quantification and identification of 0.05 ng/mL (180 pmol/L). The results clearly show that all the volunteers excreted norandrosterone glucuronide in a characteristic pattern during one menstrual cycle. Concentrations in urine were considerably lower at the beginning of the follicular and the end of the luteal phases than midcyclic. Peak concentrations up to 0.8 ng/mL (2.9 nmol/L) were recorded and they were three to four times higher than the values at the beginning and end of the cycle. The time of the peak concentration was clearly related to the increased excretion of luteinizing hormone. These results strongly support the possibility of endogenous nandrolone production as a side reaction to enzymatic aromatisation. However, a threshold value of 2 ng/mL for reporting adversed findings in doping control of females was never reached in any of the samples." @default.
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• W2078130169 date "2006-01-01" @default.
• W2078130169 modified "2023-10-16" @default.
• W2078130169 title "Determination of urinary norandrosterone excretion in females during one menstrual cycle by gas chromatography/mass spectrometry" @default.
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• W2078130169 doi "https://doi.org/10.1002/bmc.586" @default.
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