Used in veterinary research and immunology studies to measure porcine interleukin-4 (IL-4) levels in biological samples such as serum, plasma, or cell culture supernatants. It helps assess immune responses in pigs, particularly in monitoring T-helper 2 (Th2) cell activity, allergic reactions, and parasitic infections. Widely applied in vaccine development, disease diagnosis, and evaluation of immunomodulatory treatments in swine. Provides a reliable and sensitive method for quantifying IL-4 concentration, supporting research in animal health and production.