FDA Product Code LDJ: Enzyme Immunoassay, Cannabinoids

Cannabis use is widespread and its detection is required in workplace and forensic settings. FDA product code LDJ covers enzyme immunoassay systems for cannabinoid detection in biological specimens.

These tests detect THC metabolites — particularly 11-nor-9-carboxy-THC — in urine, enabling screening for cannabis use in workplace drug testing, probation monitoring, and clinical settings. Cannabis metabolites can be detected for days to weeks after use.

LDJ devices are Class II medical devices, regulated under 21 CFR 862.3870 and reviewed by the FDA Toxicology panel.

Leading manufacturers include Lin-Zhi International, Inc., Immunalysis Corporation and Healgen Scientific, LLC.