Used to measure interleukin-5 (IL-5) levels in human serum, plasma, or cell culture samples. It is commonly applied in immunology and medical research to study allergic responses, asthma, and eosinophil-related diseases. The kit helps quantify IL-5, a cytokine involved in eosinophil activation and differentiation, enabling researchers to assess immune system activity and inflammation in clinical and experimental settings. It is widely used in laboratories for biomarker detection and drug development studies targeting type 2 immune responses.