Used to quantitatively measure rat IgG2b levels in biological samples such as serum, plasma, or cell culture supernatants. Commonly applied in immunology research to assess immune responses in rat models, particularly in studies involving monoclonal antibody development, vaccine efficacy, and autoimmune diseases. The kit enables high-throughput analysis with high specificity due to antibody-antigen recognition, making it valuable in preclinical studies and therapeutic monitoring.