Degradation of urine samples and its influence on the 13C/12C ratios of excreted steroids

von Piper, Thomas (Autor), ... Geyer, Hans (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Drug testing and analysis, 2 (2010), 11/12, S. 620-629, Lit.

Recent advances in doping analysis (15) : Proceedings of the Manfred Donike Workshop ; 25th Cologne Workshop on Dope Analysis ; 25th February to 2nd March 2007

von Schänzer, Wilhelm (Hrsg.), ... Geyer, Hans (Hrsg.), Gotzmann, Andrea (Hrsg.), Mareck, U. (Hrsg.) Köln: Sportverl. Strauß (Verlag), 2007, 444 S., Lit.

Recent advances in doping analysis (14) : Proceedings of the Manfred Donike Workshop ; 24th Cologne Workshop on Dope Analysis ; 4th to 9th June 2006

von Schänzer, Wilhelm (Hrsg.), ... Geyer, Hans (Hrsg.), Gotzmann, Andrea (Hrsg.), Mareck, U. (Hrsg.) Köln: Sportverl. Strauß (Verlag), 2006, 492 S., Lit.

Atypical steroid profiles in connection with ethanol findings in urine

von Geyer, Hans (Autor), ... Mareck, Ute (Autor), Haenelt, N. (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (17) : Proceedings of the Manfred Donike Workshop ; 27th Cologne Workshop on Dope Analysis ; 1st to 6th March 2009, Köln: Sportverl. Strauß (Verlag), 2009, S. 261-264, Lit.

Recent advances in doping analysis (17) : Proceedings of the Manfred Donike Workshop ; 27th Cologne Workshop on Dope Analysis ; 1st to 6th March 2009

von Schänzer, Wilhelm (Hrsg.), ... Geyer, Hans (Hrsg.), Gotzmann, Andrea (Hrsg.), Mareck, Ute (Hrsg.) Köln: Sportverl. Strauß (Verlag), 2009, 334 S., Lit.

Urinary ethyl glucuronide in samples with elevated T/E ratios – evaluation of gender, sport discipline, type of control and concentration

von Mareck, Ute (Autor), ... Guddat, Sven (Autor), Geyer, Hans (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (21) : Proceedings of the Manfred-Donike-Workshop ; 31th Cologne Workshop on Dope Analysis ; 24th February to 1st March 2013, Köln: Sportverl. Strauß (Verlag), 2013, S. 109-112, Lit.

Preliminary results regarding the detection of the misuse of testosterone gel

von Geyer, Hans (Autor), ... Flenker, U. (Autor), Mareck, U. (Autor), Sommer, F. (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (12) : Proceedings of the Manfred Donike Workshop ; 22th Cologne Workshop on Dope Analysis ; 7th to 12th March 2004, Köln: Sport u. Buch Strauß (Verlag), 2004, S. 121-127, Lit.

Determination of 13C/12C ratios of urinary excreted boldenone and its main metabolite 5beta-androst-1-en-17beta-ol-3-one

von Piper, Thomas (Autor), ... Geyer, Hans (Autor), Gougoulidis, Vassilios (Autor), Flenker, Ulrich (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Drug testing and analysis, 2 (2010), 5, S. 217–224, Lit.

Factors influencing the steroid profile in doping control analysis

von Mareck, Ute (Autor), ... Geyer, Hans (Autor), Opfermann, Georg (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Journal of mass spectrometry : JMS, 43 (2008), 7 (Sports doping explored), S. 877-891, Lit.

Evaluation of doping control samples to determine the prevalence of nicotine use by German elite athletes

von Rubio Alaejos, Ana (Autor), ... Sigmund, Gerd (Autor), Piper, Thomas (Autor), Geyer, Hans (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (29) : Proceedings of the Manfred Donike Workshop ; 39th Cologne Workshop on Dope Analysis 22nd to 26th March 2021, Hellenthal: Sportverl. Strauß (Verlag), 2021, S. 167-170, Lit.

Serum testosterone and urinary excretion of steroid hormone metabolites after administration of a high-dose zinc supplement.

von Köhler, Karsten (Autor), ... Parr, M.K. (Autor), Geyer, Hans (Autor), Mester, Joachim (Autor), Schänzer, Wilhelm (Autor)
Erschienen in European journal of clinical nutrition, 63 (2009), 1, S. 65-70, Lit.

Clenbuterol marketed as dietary supplement

von Parr, Maria Kristina (Autor), ... Köhler, Karsten (Autor), Geyer, Hans (Autor), Guddat, Sven (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Biomedical chromatography, 22 (2008), 3, S. 298-300, Lit.

GC -single and -triple quadrupole mass spectrometry in steroid profiling

von Mareck, Ute (Autor), ... Fußhöller, Gregor (Autor), Geyer, Hans (Autor), Opfermann, Georg (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (20) : Proceedings of the Manfred-Donike-Workshop ; 30th Cologne Workshop on Dope Analysis ; 26th February to 2nd March 2012 2. Variante, Köln: Sportverl. Strauß (Verlag), 2012, S. 189-192, Lit.

Mildronate (Meldonium) in professional sports : monitoring doping control urine samples using hydrophilic interaction liquid chromatography – high resolution/high accuracy mass spe...

von Görgens, Christian (Autor), ... Guddat, Sven (Autor), Dib, Josef (Autor), Geyer, Hans (Autor), Schänzer, Wilhelm (Autor), Thevis, Mario (Autor)
Erschienen in Drug testing and analysis, 7 (2015), 11/12 (33rd Cologne workshop: Advances in sports drug testing), S. 973-979, Lit.

Alternative steroid profiling : reference ranges for urinary endogenous steroids in a Caucasian population of athletes

von Renterghem, P. van (Autor), ... Eenoo, P. van (Autor), Geyer, Hans (Autor), Schänzer, Wilhelm (Autor), Delbeke, F.T. (Autor)
Erschienen in Recent advances in doping analysis (17) : Proceedings of the Manfred Donike Workshop ; 27th Cologne Workshop on Dope Analysis ; 1st to 6th March 2009, Köln: Sportverl. Strauß (Verlag), 2009, S. 81-90, Lit.

Comprehensive sample preparation for anabolic steroids, Glucocorticosteroids, Beta-Receptor blocking agents, selected anabolic androgenic steroids and Buprenorphine in human urine

von Mareck, U. (Autor), ... Thevis, Mario (Autor), Guddat, S. (Autor), Gotzmann, Andrea (Autor), Bredehöft, M. (Autor), Geyer, Hans (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (12) : Proceedings of the Manfred Donike Workshop ; 22th Cologne Workshop on Dope Analysis ; 7th to 12th March 2004, Köln: Sport u. Buch Strauß (Verlag), 2004, S. 65-68, Lit.

Additional investigations in connection with atypical findings for 19-norandrosterone : a case study

von Fußhöller, Gregor (Autor), ... Geyer, Hans (Autor), Haenelt, Nadine (Autor), Hülsemann, Frank (Autor), Gougoulidis, Vassilios (Autor), Blatt, Christina (Autor), Thevis, Mario (Autor)
Erschienen in Recent advances in doping analysis (29) : Proceedings of the Manfred Donike Workshop ; 39th Cologne Workshop on Dope Analysis 22nd to 26th March 2021, Hellenthal: Sportverl. Strauß (Verlag), 2021, S. 38-40, Lit.

Determination of 13C/12C ratios of endogenous urinary steroids : method validation, reference population and application to doping control purposes

von Piper, Thomas (Autor), ... Mareck, Ute (Autor), Geyer, Hans (Autor), Flenker, Ulrich (Autor), Thevis, Mario (Autor), Platen, Petra (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Rapid communications in mass spectrometry, 22 (2008), 14, S. 2161-2175, Lit.

New steroids on the "supplement" market

von Parr, M.K. (Autor), ... Geyer, Hans (Autor), Gütschow, M. (Autor), Haenelt, N. (Autor), Opfermann, G. (Autor), Thevis, Mario (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Recent advances in doping analysis (16) : Proceedings of the Manfred Donike Workshop ; 26th Cologne Workshop on Dope Analysis ; 24th to 29th February 2008, Köln: Sportverl. Strauß (Verlag), 2008, S. 73-82, Lit.

Glycerol administration before endurance exercise : metabolism, urinary glycerol excretion and effects on doping-relevant blood parameters

von Köhler, Karsten (Autor), ... Braun, Hans (Autor), Marées, Markus de (Autor), Geyer, Hans (Autor), Thevis, Mario (Autor), Mester, Joachim (Autor), Schänzer, Wilhelm (Autor)
Erschienen in Drug testing and analysis, 6 (2014), 3/4, S. 202-209, Lit.