title: Use of stable isotopes in measuring low concentrations of drugs and drug metabolites by GC-MS-COM procedures.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D001463:Barbiturates / Q000097:blood; D002110:Caffeine / Q000032:analysis / Q000097:blood; D002247:Carbon Isotopes; D002648:Child; D002849:Chromatography, Gas; D003126:Colostrum / Q000032:analysis*; D003201:Computers; D005227:Fatty Acids / Q000097:blood; D005260:Female; D006801:Humans; D006993:Hypnotics and Sedatives / Q000032:analysis* / Q000652:urine; D007231:Infant, Newborn; D008297:Male; D013058:Mass Spectrometry; D008431:Maternal-Fetal Exchange; D008722:Methods; D008832:Microchemistry; D008895:Milk, Human / Q000032:analysis*; D010634:Phenobarbital / Q000032:analysis; D010672:Phenytoin / Q000032:analysis* / Q000097:blood; D011247:Pregnancy
chemical_list: D001463:Barbiturates; D002247:Carbon Isotopes; D005227:Fatty Acids; D006993:Hypnotics and Sedatives; D002110:Caffeine; D010672:Phenytoin; D010634:Phenobarbital