Used in immunological research to quantify the soluble terminal complement complex (sC5b-9) in biological samples such as plasma, serum, or cerebrospinal fluid. Helps assess complement system activation, which is involved in inflammatory and autoimmune diseases, transplant rejection, sepsis, and age-related macular degeneration. Enables researchers to study the role of membrane attack complex formation in disease progression and evaluate potential therapeutic interventions targeting the complement pathway. Provides a sensitive and specific tool for monitoring disease activity and treatment response in clinical and preclinical studies.