Used to measure interleukin-5 (IL-5) levels in biological samples such as serum, plasma, or cell culture supernatants from mice. It is commonly applied in immunology and inflammation research to study the role of IL-5 in eosinophil activation and differentiation, particularly in models of allergic diseases like asthma, parasitic infections, and other eosinophil-associated conditions. The kit enables researchers to quantify IL-5 with high sensitivity and specificity, supporting evaluation of immune responses and therapeutic interventions in preclinical studies.