Human urine samples after fish consumption have been investigated by low-temp. gas chromatog. with inductively coupled plasma mass spectrometric detection after sample derivatization by hydride generation (HG/LT-GC/ICP-MS). This anal. technique enabled the identification of organometal(loid) compds. in human urine; species of the six elements germanium, arsenic, selenium, tin, antimony, and mercury were detd. Three different org. selenium species, two germanium species, seven arsenic species, four tin species, five antimony species, and one species of mercury were found; 18 of the 22 species detected could be identified. The relative detection limits ranged between 2 and 12 pg x L-1 (x=element). These organometal(loid) compds. probably build up in the human body under the influence of micro-organisms, in the presence of hydrogen sulfide and methane, in the human intestine.