Typing of RBCs with reagent antiserum represents which type of reaction?

Typing of RBCs with reagent antiserum represents which type of reaction?

• A. Direct hemagglutination
• B. Passive hemagglutination
• C. Hemagglutination inhibition
• D. Reverse passive hemagglutination

Answer: (D)

The main idea here is how hemagglutination signals the presence of specific RBC antigens through antibody–antigen interactions. When you type red blood cells using reagent antisera, you’re using antibodies to detect which antigens are present on the cell surface. In this approach, the antibodies are effectively presented on a carrier (the cells or a carrier prepared from them), so the reaction occurs as the soluble or surrounding components bridge those antibody-coated carriers and the cells agglutinate. This arrangement, where the antibody is anchored to the carrier and agglutination results from its interaction with antigen in the sample, is called reverse passive hemagglutination.

The main idea here is how hemagglutination signals the presence of specific RBC antigens through antibody–antigen interactions. When you type red blood cells using reagent antisera, you’re using antibodies to detect which antigens are present on the cell surface. In this approach, the antibodies are effectively presented on a carrier (the cells or a carrier prepared from them), so the reaction occurs as the soluble or surrounding components bridge those antibody-coated carriers and the cells agglutinate. This arrangement, where the antibody is anchored to the carrier and agglutination results from its interaction with antigen in the sample, is called reverse passive hemagglutination.