What Is Fentanyl Cut Off?

What Is Fentanyl Cut Off? The ARK Fentanyl Assay is an immunoassay intended for the qualitative detection of fentanyl in human urine at a cutoff concentration of 1.0 ng/mL. The assay is intended for use in laboratories with automated clinical chemistry analyzers. This in vitro diagnostic device is for prescription use only. What is the