Used to measure levels of interleukin-4 (IL-4) in biological samples such as serum, plasma, or cell culture supernatants from monkeys. It is commonly applied in immunological research to study T-cell responses, allergic reactions, and immune regulation in non-human primate models. The kit helps evaluate cytokine profiles in vaccine development, infectious disease studies, and inflammation research where monkey models are used to mimic human immune responses. Its high sensitivity and specificity allow accurate quantification of IL-4, supporting data reliability in preclinical studies.