Blood Grouping Reagents are specialized laboratory reagents used to identify and determine a person’s ABO and Rh blood group by detecting specific antigens present on red blood cells. They are widely used in blood banks, hospitals, diagnostic laboratories, and transfusion centers to ensure accurate blood typing and compatibility before transfusion. Common reagents include Anti-A, Anti-B, and Anti-D, which help produce reliable agglutination reactions for blood group identification.