Drug testing for thc

THC is one of the "NIDA 5". The five drugs tested for in standard NIDA approved drug tests. A single use of cannabis may be detected by a typical urine drug test for 1-6 days depending on amount smoked, individual body metabolism rates, and the cutoff level used by the test (15 ng/ml, 20 ng/ml, 50 ng/ml, 100 ng/ml). Chronic or daily use may be detected by a typical urine drug test for 7-30 days depending on the same factors listed above. Lower levels of Cannabinoids do remain in the body for longer than 30 days, but appear unlikely to result in a positive drug test due to cutoff levels.
Tetrahydrocannabinol (THC) is rapidly absorbed by inhalation and the gastrointestinal tract. It is almost completely metabolized. The predominant metabolite is 9-carboxy-11-nor-delta-9-THC, which found in the plasma, feces and urine along with other compounds. Very low concentrations of THC may be detected in urine during the initial several hours, but tetrahydrocannabinol persists in urine at a detectable concentration for many days after smoking.
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