Used in immunological research to detect and quantify duck interleukin-4 (IL-4) levels in biological samples such as serum, plasma, or cell culture supernatants. This ELISA kit is specifically designed for studying immune responses in ducks, particularly in the context of allergic reactions, parasitic infections, and T-helper cell activity. It enables researchers to monitor cytokine production in avian models, supporting studies in veterinary immunology, vaccine development, and disease pathogenesis. The assay provides a sensitive and reliable method for measuring IL-4 concentration, aiding in the understanding of the avian immune system and evaluating the efficacy of therapeutic interventions.