title: Quality assurance in drug-use testing.
authors: Department of Pathology, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298.
authors: R V
authors: RV
authors: Blanke
mesh_terms: D006801:Humans; D008722:Methods; D004364:Pharmaceutical Preparations / Q000652:urine*; D011786:Quality Control; D019966:Substance-Related Disorders / Q000175:diagnosis*
chemical_list: D004364:Pharmaceutical Preparations