Cannabis usually stays detectable in urine for 1 to 3 days after a single use, 3 to 7 days for occasional use, and 10 to 30 days or longer for daily or heavy use. The standard immunoassay screen uses a 50 ng/mL cutoff, and a positive screen is typically confirmed with GC-MS at a 15 ng/mL cutoff. Detection time depends on dose, frequency, body fat, metabolism, and the potency of what was used.

How long does cannabis stay in urine?

Published detection windows track usage pattern rather than the drug itself. THC metabolites are fat-soluble, so they clear the body slower than most other substances.

• Single use: roughly 1 to 3 days.
• Moderate use (a few times per week): roughly 3 to 7 days.
• Daily use: roughly 7 to 21 days.
• Heavy, long-term use (multiple times per day or high-potency concentrates): 30 days or more, with case reports extending to 60 to 90 days.

What makes the detection window longer or shorter?

Body fat percentage, frequency of use, dose per session, and metabolic rate are the biggest levers. THC stores in adipose tissue and releases back into the bloodstream over time, which extends clearance. Age, liver health, hydration, and activity level also shift the timeline.

Does CBD show up on a urine drug test?

Pure CBD isolate should not trigger a standard THC screen because these tests target THC metabolites, not cannabidiol. Full-spectrum CBD products may contain small amounts of THC, and repeated high doses can accumulate above the 50 ng/mL threshold. Check a product certificate of analysis for THC content before you rely on it.

What cutoff levels do labs use?

Federal workplace testing screens urine at 50 ng/mL for THC metabolites, then confirms positives at 15 ng/mL. Some employers and courts use lower cutoffs, which lengthens the apparent detection window. Labs also measure creatinine and specific gravity to flag diluted samples.

Can you clear THC from your system faster?

No method has been shown to reliably speed THC clearance. Drinking water dilutes urine, but labs screen for dilution, and a diluted sample may be rejected or treated as a refusal. Products marketed as detox kits are not supported by clinical evidence.

• Time and individual metabolism are the only dependable variables.
• Exercise and fat loss may release stored metabolites, which can briefly raise urine levels.
• Secondhand exposure is unlikely to cause a positive result at standard cutoffs.