Used in clinical and research laboratories to measure levels of eosinophil cationic protein (ECP) in biological samples such as serum, plasma, or sputum. Elevated ECP levels are associated with eosinophil activation, commonly seen in allergic diseases like asthma, allergic rhinitis, and atopic dermatitis. The kit helps in monitoring disease activity and response to treatment in patients with eosinophilic inflammation. It is also used in immunological research to study eosinophil behavior in parasitic infections, autoimmune conditions, and other inflammatory disorders. The assay provides a sensitive and specific quantitative measurement, supporting both diagnostic procedures and therapeutic development in allergy and immunology fields.