title: Interpretation of urine quantitative 11-nor-delta-9 tetrahydrocannabinol-9-carboxylic acid to determine abstinence from marijuana smoking.
abstract: Verification of abstinence from cannabinoid use after initial identification requires documentation of falling quantitative levels of urinary 11-nor-delta-9-tetrahydrocannabinol-9-carboxylic acid (THC-COOH) over an extended time period. We present a case in which normalization of quantitative urinary THC-COOH results to urinary creatinine is required to correctly interpret a series of quantitative levels and confirm abstinence from marijuana smoking.
authors.affiliation: Department of Pathology and Pharmacy Practice, University of Arkansas for Medical Sciences, Little Rock 72205.
authors.forename: R
authors.initials: R
authors.lastname: Bell
authors.forename: E H
authors.initials: EH
authors.lastname: Taylor
authors.forename: B
authors.initials: B
authors.lastname: Ackerman
authors.forename: A A
authors.initials: AA
authors.lastname: Pappas
mesh_terms: D003404:Creatinine / Q000652:urine; D013759:Dronabinol / Q000031:analogs & derivatives* / Q000652:urine; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006801:Humans; D002189:Marijuana Abuse / Q000175:diagnosis*
chemical_list: C016780:11-nor-delta(9)-tetrahydrocannabinol-9-carboxylic acid; D013759:Dronabinol; D003404:Creatinine