Used in immunological research to quantify eosinophil chemotactic factors in biological samples such as serum, plasma, and cell culture supernatants. Helps investigate allergic responses, asthma, and parasitic infections by measuring chemokine levels involved in eosinophil recruitment. Supports biomarker discovery and therapeutic development by providing a reliable method to assess inflammatory activity in experimental models. Commonly used in clinical research settings to evaluate immune system modulation and treatment efficacy in eosinophil-related disorders.