Used in immunological research to quantitatively measure complement factor B in biological samples such as serum or plasma. Enables study of the alternative complement pathway activation, which plays a key role in innate immunity, inflammation, and host defense. Commonly applied in research related to autoimmune diseases, transplant rejection, and infectious diseases to assess complement system involvement. The kit supports high-throughput analysis in clinical and preclinical settings, aiding biomarker discovery and therapeutic monitoring.