title: Falsely negative urine drug assay results due to filtration.
authors.forename: J D
authors.initials: JD
authors.lastname: Mitchell
authors.forename: B J
authors.initials: BJ
authors.lastname: Perrigo
authors.forename: V A
authors.initials: VA
authors.lastname: Mason-Daniel
mesh_terms: D017248:Enzyme Multiplied Immunoassay Technique / Q000592:standards; D005188:False Negative Reactions; D005374:Filtration; D006801:Humans; D011933:Reagent Kits, Diagnostic / Q000592:standards; D014116:Toxicology; D014556:Urine / Q000737:chemistry*
chemical_list: D011933:Reagent Kits, Diagnostic