How Long Does THC Stay in Urine?
THC detection in urine depends heavily on frequency of use.
Detection Windows
- Single use: 3 days
- Moderate (3×/week): 5–7 days
- Heavy (daily): 10–15 days
- Chronic heavy: 30+ days
Why So Variable
- THC-COOH is fat-soluble
- Stored in fat cells
- Releases slowly into bloodstream
- Higher body fat = longer detection
What Affects Detection
- Frequency and amount of use
- Body fat percentage
- Metabolism
- Hydration
- Exercise (can temporarily raise levels by releasing stored THC)
Source: SAMHSA, NIDA, Mayo Clinic.
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