What is the purpose of performing an elution in direct antiglobulin testing?

What is the purpose of performing an elution in direct antiglobulin testing?

• A. Remove bound antibodies to identify specificity
• B. Increase agglutination
• C. Neutralize autoantibody
• D. Remove complement

Answer: (A)

Elution in direct antiglobulin testing is used to detach antibodies that are already bound to red cells, so you can test the released antibodies to identify their specific targets. After a DAT shows that red cells are coated with IgG (or sometimes complement), the eluate is tested against an antigen panel to determine which antigen the antibody recognizes. This helps determine whether the antibody is allohemagglutinin (from transfusion or pregnancy) or an autoantibody, guiding appropriate transfusion decisions. Elution is not about increasing agglutination, neutralizing autoantibody, or removing complement; its purpose is to recover the bound antibody for specificity testing.

Elution in direct antiglobulin testing is used to detach antibodies that are already bound to red cells, so you can test the released antibodies to identify their specific targets. After a DAT shows that red cells are coated with IgG (or sometimes complement), the eluate is tested against an antigen panel to determine which antigen the antibody recognizes. This helps determine whether the antibody is allohemagglutinin (from transfusion or pregnancy) or an autoantibody, guiding appropriate transfusion decisions. Elution is not about increasing agglutination, neutralizing autoantibody, or removing complement; its purpose is to recover the bound antibody for specificity testing.