Used in biomedical research to quantify CD40 protein levels in biological samples such as serum, plasma, and cell culture supernatants. Enables researchers to study immune system activation, as CD40 plays a key role in B-cell maturation, antibody production, and antigen presentation. Commonly applied in studies related to autoimmune diseases, cancer immunology, and inflammatory disorders. Supports drug development by monitoring CD40 expression changes in response to therapeutic agents. Provides a reliable, sensitive, and high-throughput method for detecting soluble CD40 in clinical and experimental settings.