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Reference ranges for urinary concentrations and ratios of endogenous steroids, which can be used as markers for steroid misuse, in a Caucasian population of athletes.
Van Renterghem P, Van Eenoo P, Geyer H, Schänzer W, Delbeke FT. Van Renterghem P, et al. Among authors: geyer h. Steroids. 2010 Feb;75(2):154-63. doi: 10.1016/j.steroids.2009.11.008. Epub 2009 Dec 3. Steroids. 2010. PMID: 19962394 Review.
Evaluation of longitudinal steroid profiles from male football players in UEFA competitions between 2008 and 2013.
Baume N, Geyer H, Vouillamoz M, Grisdale R, Earl M, Aguilera R, Cowan DA, Ericsson M, Gmeiner G, Kwiatkowska D, Kioukia-Fougia N, Molina A, Ruivo J, Segura J, Van Eenoo P, Jan N, Robinson N, Saugy M. Baume N, et al. Among authors: geyer h. Drug Test Anal. 2016 Jul;8(7):603-12. doi: 10.1002/dta.1851. Epub 2015 Sep 3. Drug Test Anal. 2016. PMID: 26338140
Seized designer supplement named "1-Androsterone": identification as 3β-hydroxy-5α-androst-1-en-17-one and its urinary elimination.
Parr MK, Opfermann G, Geyer H, Westphal F, Sönnichsen FD, Zapp J, Kwiatkowska D, Schänzer W. Parr MK, et al. Among authors: geyer h. Steroids. 2011 May;76(6):540-7. doi: 10.1016/j.steroids.2011.02.001. Epub 2011 Feb 16. Steroids. 2011. PMID: 21310167
Determination of 13C/12C ratios of urinary epitestosterone and its main metabolites 5alpha- and 5beta-androstane-3alpha, 17alpha-diol.
Piper T, Riemann P, Opfermann G, Mareck U, Geyer H, Vajiala G, Flenker U, Schänzer W. Piper T, et al. Among authors: geyer h. Drug Test Anal. 2009 Nov;1(11-12):576-86. doi: 10.1002/dta.53. Drug Test Anal. 2009. PMID: 20355174
Degradation of urine samples and its influence on the ¹³C/¹²C ratios of excreted steroids.
Piper T, Geyer H, Schänzer W. Piper T, et al. Among authors: geyer h. Drug Test Anal. 2010 Nov-Dec;2(11-12):620-9. doi: 10.1002/dta.219. Epub 2010 Nov 16. Drug Test Anal. 2010. PMID: 21204293
Determination of (13)C/(12)C ratios of urinary excreted boldenone and its main metabolite 5beta-androst-1-en-17beta-ol-3-one.
Piper T, Geyer H, Gougoulidis V, Flenker U, Schänzer W. Piper T, et al. Among authors: geyer h. Drug Test Anal. 2010 May;2(5):217-24. doi: 10.1002/dta.124. Drug Test Anal. 2010. PMID: 20468009
Factors influencing the steroid profile in doping control analysis.
Mareck U, Geyer H, Opfermann G, Thevis M, Schänzer W. Mareck U, et al. Among authors: geyer h. J Mass Spectrom. 2008 Jul;43(7):877-91. doi: 10.1002/jms.1457. J Mass Spectrom. 2008. PMID: 18570179 Review.
Determination of 13C/12C ratios of endogenous urinary steroids: method validation, reference population and application to doping control purposes.
Piper T, Mareck U, Geyer H, Flenker U, Thevis M, Platen P, Schänzer W. Piper T, et al. Among authors: geyer h. Rapid Commun Mass Spectrom. 2008 Jul;22(14):2161-75. doi: 10.1002/rcm.3601. Rapid Commun Mass Spectrom. 2008. PMID: 18536069
Detection of dehydroepiandrosterone misuse by means of gas chromatography- combustion-isotope ratio mass spectrometry.
Mareck U, Geyer H, Flenker U, Piper T, Thevis M, Schänzer W. Mareck U, et al. Among authors: geyer h. Eur J Mass Spectrom (Chichester). 2007;13(6):419-26. doi: 10.1255/ejms.900. Eur J Mass Spectrom (Chichester). 2007. PMID: 18417762
Doping-control analysis of the 5alpha-reductase inhibitor finasteride: determination of its influence on urinary steroid profiles and detection of its major urinary metabolite.
Thevis M, Geyer H, Mareck U, Flenker U, Schänzer W. Thevis M, et al. Among authors: geyer h. Ther Drug Monit. 2007 Apr;29(2):236-47. doi: 10.1097/FTD.0b013e31803bb85d. Ther Drug Monit. 2007. PMID: 17417080 Clinical Trial.
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