Used in immunological research to quantify Human T cell growth factor III (also known as interleukin-5 or IL-5) in biological samples such as serum, plasma, and cell culture supernatants. The ELISA kit enables researchers to study the role of IL-5 in immune responses, particularly in eosinophil activation and differentiation, which is critical in understanding allergic diseases like asthma, allergic rhinitis, and parasitic infections. It is also used in monitoring therapeutic interventions targeting the IL-5 pathway and in clinical research to assess biomarker levels in inflammatory and autoimmune conditions. The assay provides high specificity and sensitivity, making it suitable for both basic research and drug development settings.