how long is fentanyl in your system
How long does Fentanyl stay in urine? Typically, a urine test can detect fentanyl from 8 hours to 24 hours from the last drug intake. How long does Fentanyl stay in blood? Another common drug test that experts to analyze drug abuse is through blood testing. On average, fentanyl stays in the blood for more than 12 hours from the last dose.