Used in immunoassay research to quantify complement factor H levels in biological samples such as serum, plasma, or cell culture supernatants. Enables study of the complement system's regulation in inflammatory and autoimmune diseases, including age-related macular degeneration, atypical hemolytic uremic syndrome, and systemic lupus erythematosus. Supports biomarker validation, therapeutic monitoring, and preclinical research by providing a reliable method to assess CFH concentration changes under different experimental or pathological conditions.