Description General description This stable-labeled internal standard is suitable for quantification of ortho-Fluorofentanyl levels in urine or other matrices by LC/MS or GC/MS for clinical toxicology, forensic analysis, or urine drug testing applications. ortho-Fluorofentanyl, also known as 2-Fluorofentanyl, is an opioid analgesic being an analogue of fentanyl that is sold as designer drug on the illicit drug market. Legal Information CERILLIANT is a registered trademark of Cerilliant Corporation