Used in immunology research to quantify properdin levels in biological samples such as serum or plasma. Helps assess the activity of the alternative complement pathway, which plays a key role in innate immunity. Commonly applied in studies related to inflammatory diseases, autoimmune disorders, and host defense mechanisms. Enables researchers to investigate properdin deficiency and its association with increased susceptibility to infections. Suitable for use in clinical labs and biomedical research settings where precise measurement of complement system components is required.