Used in immunological research to quantify eosinophil cationic protein (ECP) levels in biological samples such as serum, plasma, or cell culture supernatants. This kit is particularly valuable in studies related to allergic diseases, asthma, and other conditions involving eosinophil activation. By measuring ECP concentration, researchers can assess the degree of eosinophil degranulation, which reflects the severity of inflammatory responses. It supports investigation into immune responses, monitoring of disease progression, and evaluation of therapeutic interventions in eosinophil-associated disorders.