Fentanyl
Interpretation
- The presence of fentanyl or norfentanyl >LOQ indicates exposure to fentanyl within 3 days.
Metabolites
- Fentanyl is metabolized primarily by oxidative N-dealkylation to norfentanyl.
Fentanyl → Norfentanyl
Confirmation Tests:
Approximate Detection Times
| Fentanyl | LOQ (ng/mL) | Detection Time* up to |
|---|---|---|
| Fentanyl | 0.2 | 3 days |
| Norfentanyl | 1.0 | 3 days |
*These are approximate detection times for the drug or metabolites in urine. The actual detection time depends on dose, frequency of
use, and individual metabolism.