Used in immunological research to measure levels of human hemolytic complement activity in biological samples. Enables quantification of complement system function, particularly in studies related to immune response, autoimmune diseases, and inflammation. Commonly applied in clinical research and drug development to assess complement activation or deficiency. Suitable for serum, plasma, and cell culture supernatant analysis. Supports investigation into conditions such as lupus, rheumatoid arthritis, and other complement-mediated disorders.