cannabis detection window in blood and hair

Most standard drug screens can find cannabis far longer in hair than in blood. As a general answer: blood testing reflects recent use, usually within hours to a couple of days, while a hair test can reach back roughly 90 days and sometimes longer. The real cannabis detection window in blood and hair depends on how often you use, dose and potency, body composition, hair length, and the cutoff level the lab applies.

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How long does THC stay in blood?

Blood is a short-term marker. THC peaks within minutes to a few hours of smoking or vaping and is usually below common cutoffs within 12 to 24 hours for occasional users. Chronic, heavy consumers may still test positive for a few days, and the inactive metabolite THC-COOH can linger longer than the parent drug.

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How long does cannabis stay in hair?

Scalp hair grows about one centimeter per month, so a full head of hair carries roughly a 90-day record, and long hair can hold detectable traces for six months or more. Segmental testing can roughly map when use occurred, while body hair grows slower and gives a less precise timeline.

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Key Features That Move Your Detection Window

• Frequency of use: daily, long-term consumers generally clear THC much slower than one-time users.
• Dose and potency: high-THC concentrates, dabs, and edibles can extend detection in both specimen types.
• Body fat and metabolism: THC is fat-soluble, so it stores in tissue and releases gradually.
• Hair length and growth rate: short or recently cut hair offers a narrower window than long hair.
• Hair treatment: bleaching, dyeing, and chemical processing can alter measured concentrations in unpredictable ways.
• Lab cutoffs: a 1 pg/mg hair screen is dramatically more sensitive than a typical 50 ng/mL blood screen.
• Timing of collection: a blood draw taken days after use may already read negative even in regular users.

What specimen and cutoff standards apply?

Blood is collected in gray-top tubes and analyzed by immunoassay with GC-MS or LC-MS/MS confirmation, targeting THC and its metabolites. Hair is washed, chopped or segmented, digested, and screened against a very low threshold, commonly 1 pg/mg for THC. Both methods use a screening cutoff followed by a confirmation cutoff, and results below the confirmation threshold are reported as negative. No test is perfectly accurate — passive exposure, contamination, and lab variance can all influence an outcome.

How does ordering work, and what about shipping and returns?

Orders placed with Pop's Cannabis ship discreetly in plain packaging, usually within one business day, and tracking is provided. Unopened products can be returned under our standard policy, and our team is happy to answer questions about an order before or after it arrives.