What Does THC Mean on a Drug Test? (Marijuana metabolite)?
Evidence-based answer reviewed against SAMHSA cutoffs and FDA assay documentation · Updated August 2026
Quick answer: THC is the laboratory abbreviation for Marijuana metabolite. THC is the cannabis strip (THC-COOH at 50/15 ng/mL). Fat-soluble storage makes it the longest-lasting common analyte.
Reading your cup or lab report
Multi-panel cups print 2–4 letter codes beside each strip line. One line per drug class; a visible control line plus absent drug line = negative for that class. Faint lines still count as present (they're competitive-inhibition assays) — the classic misread.
About THC
Urine immunoassay screens for the metabolite THC-COOH at 50 ng/mL (initial) with GC–MS confirmation at 15 ng/mL (SAMHSA workplace standard).
Urine drug tests do not look for active THC. They look for THC-COOH, an inactive metabolite your liver produces after you consume cannabis in any form — flower, vape carts, dabs, or edibles. Because the metabolite is fat-soluble, it lingers far longer than the high itself, and there is no reliable way to predict an individual's exact clearance time from a chart.
Detection windows
| Test type | Typical THC detection window |
|---|---|
| Urine | occasional: about 3 days · regular: 5–7 days · daily: 10–15 days · heavy: 30+ days in well-documented chronic heavy-use cases |
| Saliva (Mouth Swab) | occasional: 24 hours; regular: up to 72 hours; daily: up to 72 hours |
| Hair Follicles | up to 90 days (standard head-hair window) |
| Blood | occasional: 12–24 hours; regular: up to 2 days |
Related codes on the same cup
Cups group codes logically: AMP/mAMP (stimulants), OPI/MOP/OXY/BUP (opioid family), BZO/BAR (depressants), COC/THC/PCP (classics), plus validity markers like creatinine printed on lab reports rather than cups.
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Do prescriptions count against me?
No — verified prescriptions report as negative through the Medical Review Officer. Declare medications at collection and answer the follow-up call.
Sources & further reading
- SAMHSA — Mandatory Guidelines for Federal Workplace Drug Testing Programs (cutoffs, MRO process)
- DOT — 49 CFR Part 40 procedures for transportation workplace testing
- Brahm NC et al., Mayo Clinic Proceedings 2008;83(1):66–76 — false-positive cross-reactivity reference
- FDA — drug-of-abuse test device labeling (detection window conventions)