Used to measure interleukin-4 (IL-4) levels in biological samples such as serum, plasma, or cell culture supernatants from rats. It is commonly applied in immunology and inflammation research to study T-helper cell responses, allergic reactions, and immune regulation. The kit enables quantitative detection of IL-4, supporting studies on asthma, parasitic infections, and autoimmune diseases in rat models. Its high sensitivity and specificity make it suitable for evaluating cytokine profiles in experimental therapeutics and vaccine development.