A cannabis drug test detects metabolites, not the parent drug. The standard target is THC-COOH (11-nor-9-carboxy-THC), the main breakdown product of delta-9 THC, and a positive result means the body processed THC at some point rather than that the person is currently impaired. Labs may also flag 11-hydroxy-THC, CBD metabolites such as 7-COOH-CBD, and metabolites of hemp-derived cannabinoids like delta-8 THC.
how long do cannabis metabolites stay in your system
What metabolites do standard drug tests look for?
Most urine and blood screens run an immunoassay that binds to THC-COOH, the most abundant and longest-lasting THC metabolite. Confirmatory testing with GC-MS or LC-MS/MS then measures that metabolite at a specific concentration.
- THC-COOH: primary marker for marijuana and hemp-derived THC exposure
- 11-hydroxy-THC: psychoactive metabolite, usually present in lower amounts
- 7-COOH-CBD: CBD metabolite, generally not targeted by THC assays
- Delta-8 and delta-10 metabolites: similar structures that can trigger the same assay
How long do cannabis metabolites stay detectable?
Detection windows depend on dose, frequency, body fat, and hydration. A single low-THC exposure may clear urine in about 1 to 3 days, while heavy daily use can stay detectable for 30 days or longer. Blood shows metabolites for hours, saliva for roughly 1 to 2 days, and hair for up to 90 days.
can cannabis metabolites be detected in blood
What cutoff levels are used?
Federal workplace urine testing screens at 50 ng/mL for THC-COOH and confirms a positive at 15 ng/mL. These thresholds exist to reduce false positives, so a trace amount below the screen cutoff reports as negative. Oral fluid and hair tests use different cutoffs set by the testing lab or employer.
Can CBD products cause a positive drug test?
Yes, in certain cases. Full-spectrum hemp extracts can contain small amounts of THC that accumulate with daily high-dose use, and some immunoassays cross-react with high concentrations of CBD metabolites. CBD isolate products carry the lowest risk because they are formulated to contain little to no THC.
Some research suggests CBD can convert to THC in an acidic stomach environment, though the amount formed is small and debated. Buyers who are drug tested should choose products with batch-level lab reports showing THC content, which is why third-party COAs matter.
What do cannabis metabolites not tell you?
Metabolite tests cannot show how much was used, when it was used, or whether the person was impaired at the time of the test. THC-COOH is a storage metabolite that lingers in fat tissue long after cognitive effects fade. A lab also cannot reliably separate hemp-derived THC from marijuana-derived THC based on the metabolite alone.
Why does this matter for CBD shoppers?
Anyone in a drug-tested job or program should treat full-spectrum CBD as a potential risk and favor isolate or broad-spectrum options with documented THC limits. Reading the certificate of analysis for total THC, not just delta-9 THC, gives the clearest picture. Testing status, not product marketing claims, should guide the choice.