How Long Does THC Stay in Your System?
THC detection windows depend on the test, not on how a person feels. For a light or one-time user, urine screening usually stays positive for about 3 days, blood for 1 to 2 days, saliva for 24 to 48 hours, and hair for up to 90 days. Heavy daily users can test positive in urine for up to 30 days, and in some cases longer.
THC metabolites are stored in fat tissue and released back into the bloodstream over time. That slow release is why urine and hair tests reach further back than blood or saliva.
Detection Windows by Test Type
- Urine: around 3 days after single use, up to 30 days with chronic heavy use.
- Blood: 1 to 2 days, with peak levels within minutes to a few hours of use.
- Saliva: 24 to 48 hours, sometimes up to 72 hours after heavy use.
- Hair: up to 90 days, limited by hair length and growth rate.
Federal workplace urine testing screens at a 50 ng/mL cutoff and confirms positives at 15 ng/mL. A sample below the screening cutoff is reported as negative even when a small amount of metabolite is present.
THC Effects on Body and Mind: A Comprehensive Guide
What Changes Your Timeline
- Frequency of use. Daily use builds more stored metabolite than weekend use.
- Body fat percentage. THC metabolites are fat-soluble, so higher body fat can extend the window.
- Dose and potency. Concentrates and edibles deliver more THC per session than low-potency flower.
- Metabolism, age, liver function, and hydration status.
- Test sensitivity. Hair tests and low confirmatory cutoffs detect smaller amounts.
No drink, pill, or detox kit has been shown to clear THC metabolites faster. Water and exercise support general health, not the chemistry of a drug screen.
How to Check a CBD Product for THC
- Open the certificate of analysis (COA) for the exact batch you plan to buy.
- Find the cannabinoid panel and read the delta-9 THC and total THC percentages.
- Compare those figures with the THC claim printed on the product page.
- Check the serving size and total cannabinoids per bottle to see how much THC a full serving can carry.
- Save the COA or batch number so you can match it to your purchase later.
Full-spectrum CBD can contain small amounts of THC, and daily servings can accumulate. Broad-spectrum and isolate products are formulated to hold THC at or below the label claim. If you are subject to drug testing, pick a product with a COA that reports non-detectable THC and confirm the batch number matches the bottle in your hand.
When to Ask a Professional
Detection times are ranges, not guarantees. A pharmacist or physician can advise on a specific test, prescription, or medical condition.