Marijuana can be detected in urine for varying lengths of time depending on the frequency and amount of use:
- For infrequent or one-time users, marijuana is typically detectable in urine for about 3 to 5 days after last use
- Moderate users (e.g., smoking about 4 times a week) may test positive for about 5 to 7 days
- Daily or chronic users can have detectable metabolites in urine for 10 to 15 days, sometimes longer
- Heavy or chronic heavy users may test positive for 30 days or more, with some reports of detection up to 90 days in extreme cases or with high body fat
The detection window depends on factors such as metabolism, body fat, frequency of use, and the sensitivity of the test cutoff level (commonly 50 ng/mL in the US)
. Hair tests can detect marijuana use for up to 90 days, while saliva and blood tests have much shorter windows (hours to a day or so)
. On Reddit, users with moderate use report needing about 2 to 3 weeks to test clean on urine tests, and heavy users sometimes require 30 to 60 days or more to clear their system
. In summary, for urine tests:
- Occasional user: up to 3–5 days
- Moderate user: about 5–10 days
- Daily/chronic user: 10–15 days
- Heavy/chronic heavy user: 30+ days, possibly up to 90 days in rare cases
Testing negative depends on individual factors and test sensitivity, so these ranges are approximate
