title: Limits of detection of carbon-13 labelled drugs and their metabolites in human urine.
mesh_terms: D000328:Adult; D001241:Aspirin / Q000652:urine; D002245:Carbon Dioxide / Q000032:analysis; D002247:Carbon Isotopes; D055598:Chemical Phenomena; D002621:Chemistry; D004032:Diet; D006801:Humans; D007553:Isotope Labeling; D008297:Male; D013058:Mass Spectrometry; D004364:Pharmaceutical Preparations / Q000652:urine*
chemical_list: D002247:Carbon Isotopes; D004364:Pharmaceutical Preparations; D002245:Carbon Dioxide; D001241:Aspirin