Used in immunological research to detect and quantify levels of complement fragment 3b receptor (C3bR) in biological samples. Helps study the activation of the complement system, particularly in relation to immune complex clearance, phagocytosis, and host defense mechanisms. Commonly applied in investigations of autoimmune diseases, infectious diseases, and inflammatory conditions where complement system dysregulation plays a role. The kit enables high-throughput analysis in serum, plasma, or cell culture samples, supporting both clinical research and drug development efforts focused on immune modulation.