Use

This test is useful for the detection and confirmation of illicit drug use involving fentanyl. Fentanyl is an extremely fast-acting synthetic opioid that interacts predominantly with the opioid mu-receptor. It is metabolized primarily to norfentanyl and other inactive metabolites. The presence of fentanyl above 0.20 ng/mL or norfentanyl above 1.0 ng/mL is a strong indicator that the patient has used fentanyl.