Used to quantitatively measure rat Immunoglobulin G1 (IgG1) levels in biological samples such as serum, plasma, or cell culture supernatants. Commonly applied in immunology research to assess humoral immune responses in rat models. Helps evaluate vaccine efficacy, monitor disease progression in autoimmune or infectious disease studies, and validate antibody production in therapeutic development. The kit enables high-throughput analysis with high specificity and sensitivity, making it suitable for preclinical studies and pharmacokinetic assessments involving rat immune systems.