Used to measure the activity of human OCT (organic cation transporter) proteins in biological samples such as cell lysates, tissue extracts, or serum. This ELISA kit enables researchers to quantify OCT function in drug transport studies, particularly in evaluating how drugs are taken up by organs like the liver, kidney, and brain. It is widely applied in pharmaceutical research to assess drug-drug interactions, nephrotoxicity, and hepatic clearance. The kit supports high-throughput screening in drug development and helps study genetic or disease-related changes in OCT expression and activity.