Used in immunological research to detect and quantify levels of human complement regulatory proteins in biological samples such as serum, plasma, or cell culture supernatants. This ELISA kit enables researchers to study the role of complement regulatory proteins in immune system regulation, inflammation, autoimmune diseases, and host-pathogen interactions. It is particularly useful in clinical and experimental studies investigating conditions like atypical hemolytic uremic syndrome (aHUS), age-related macular degeneration (AMD), and other disorders linked to dysregulation of the complement system. The assay provides a sensitive and specific method for monitoring protein expression changes in response to disease progression or therapeutic intervention.