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)