Used in immunological research to detect and quantify high-affinity IgG antibodies specific to human FcεRII (CD23) in biological samples such as serum, plasma, or cell culture supernatants. This ELISA kit enables researchers to study immune responses, particularly in the context of allergic reactions, asthma, and other IgE-mediated disorders, where FcεRII plays a regulatory role in B cell function and IgE production. It is also applied in monitoring therapeutic interventions targeting IgG-FcεRII interactions and in the development of monoclonal antibodies or biologics that modulate immune activity. Suitable for both clinical and preclinical studies requiring sensitive and specific measurement of IgG autoantibodies or immune complexes.