Used for the quantitative measurement of human interleukin-4 (IL-4) in serum, plasma, cell culture supernatants, and other biological fluids. This high sensitivity ELISA kit enables detection of low levels of IL-4, making it ideal for research involving immune response, allergic reactions, and Th2-mediated inflammation. Commonly applied in studies of asthma, atopic diseases, and autoimmune disorders to assess cytokine profiles. The assay is widely used in clinical research and drug development to monitor changes in IL-4 levels in response to treatments or disease progression.