How long is THC detectable in urine?

THC-COOH is detectable in urine for 3–7 days after single use, 7–21 days for regular use and 30–90 days for daily use. Standard cut-off is 50 ng/mL. Body fat, dose and metabolism significantly affect the window.

Key facts

  • Single use: 3–7 days
  • Regular: 7–21 days
  • Daily: 30–90 days
  • Standard cut-off: 50 ng/mL
  • Body fat extends detection

Detailed answer

Urine tests measure fat-soluble THC-COOH slowly released from adipose tissue, giving a much longer detection window than the drug's effect. Standard immunoassays (50 ng/mL cut-off): single use 3–7 days, regular use 1–3 weeks, chronic daily use up to 3 months. GC-MS confirmation tests (15 ng/mL cut-off) extend windows by ~50 %. Exercise, hydration and sauna only marginally speed up elimination.