title: Intrasubject variation of creatinine and specific gravity measurements in consecutive urine specimens of heroin users.
authors: Addiction Research Center, Natl. Inst. on Drug Abuse, Baltimore, MD 21224.
authors: B A
authors: BA
authors: Goldberger
authors: B
authors: B
authors: Loewenthal
authors: W D
authors: WD
authors: Darwin
authors: E J
authors: EJ
authors: Cone
mesh_terms: D003404:Creatinine / Q000652:urine*; D005188:False Negative Reactions; D003932:Heroin / Q000652:urine*; D006801:Humans; D008297:Male; D013046:Specific Gravity
chemical_list: D003932:Heroin; D003404:Creatinine