title: [Micro- and ultramicro methods for directly determining urea nitrogen in serum and urine (author's transl)].
mesh_terms: D000293:Adolescent; D000328:Adult; D001806:Blood Urea Nitrogen; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008722:Methods; D008832:Microchemistry; D009584:Nitrogen / Q000652:urine*; D012016:Reference Values; D014508:Urea / Q000652:urine*
chemical_list: D014508:Urea; D009584:Nitrogen