Used in immunological research to quantify eosinophil chemotactic factors in biological samples such as serum, plasma, and cell culture supernatants. Enables detection of specific chemokines involved in allergic responses and asthma-related inflammation. Commonly applied in studies focusing on eosinophil activation and recruitment in disease models. Supports investigation of therapeutic interventions targeting eosinophil-mediated pathways. Suitable for use in preclinical research and biomarker discovery in respiratory and inflammatory diseases.