Journal of toxicology. Clinical toxicology 1989
Interpretation of urine quantitative 11-nor-delta-9 tetrahydrocannabinol-9-carboxylic acid to determine abstinence from marijuana smoking.
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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.
