“…Several methods exist to determine EtG and EtS in urine, blood, hair, and other species. For the analyses of urine and serum, the following analytical methods are used: gas chromatography-mass spectrometry (GC-MS) (13,14,16,31), liquid chromatography-mass spectrometry (LC -MS) (15,18,24,35,36), LC-multiple mass spectrometry (MS n ) (14, 19 -21, 25, 27, 30), LC with pulsed electrochemical detection (22,26), capillary zone electrophoresis (23,29,33,34), and immunochemical tests (17,28,32).…”