Used in biomedical research to quantify levels of coagulation factor IX in rat plasma or serum samples. This ELISA kit enables researchers to study blood clotting disorders, evaluate the efficacy of treatments for hemophilia B in rat models, and investigate liver function, as factor IX is produced in the liver. It is particularly useful in preclinical studies involving gene therapy, protein replacement therapies, or drug development targeting the coagulation cascade. The assay provides a sensitive and specific measurement, supporting accurate assessment of factor IX concentration in experimental settings.