Blood Grouping and Haemagglutination Test

Direct Haemagglutination Test

• Based on the principle of direct haemagglutination
• Red blood cells have specific blood grouping surface antigens

Antigen-Antibody Reaction

• A antigen reacts with A antibodies
• B antigen reacts with B antibodies
• AB antigen reacts with both A and B antibodies
• D antigen reacts with D antibodies

Agglutination Reaction

• Antigen-antibody reaction causes direct agglutination
• Agglutination observed through clumping of red blood cells

Direct Haemagglutination Test

• Based on the principle of direct haemagglutination
• Red blood cells have specific blood grouping surface antigens

Antigen-Antibody Reaction

• A antigen reacts with A antibodies
• B antigen reacts with B antibodies
• AB antigen reacts with both A and B antibodies
• D antigen reacts with D antibodies

Agglutination Reaction

• Antigen-antibody reaction causes direct agglutination
• Agglutination observed through clumping of red blood cells

Forward Grouping

• Patient's red blood cells are mixed with reagents containing antibodies to specific red cell antigens
• Antibodies used include anti A, anti B, anti AB, and anti D
• Agglutination occurs if patient's red blood cells react with a specific antibody
• Blood type is determined based on the reaction with the specific antibody

This quiz assesses your knowledge on blood grouping, direct haemagglutination test, and antigen-antibody reactions. It covers the principles of agglutination reactions and their application in blood typing.