After cannabis use, THC is metabolized to compounds excreted in urine over an extended period — days in occasional users and weeks in chronic users. Confirmation testing definitively identifies THC-COOH (the major urine metabolite) at quantitative levels, distinguishing genuine cannabis use from false-positive screens.
This test is used following positive screens in workplace testing, treatment programs, legal proceedings, and clinical assessments. Sample type is urine, often under chain-of-custody protocols.
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