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Persons with 'AB' blood group are called as "Universal recipients". This is due to:
Because AB blood individuals produce NEITHER anti-A NOR anti-B antibodies in their blood plasma, foreign transfused RBCs carrying A or B antigens will not be agglutinated or destroyed. Thus, absence of plasma antibodies enables universal reception!
The ABO blood group system is governed by surface oligosaccharide antigens on red blood cell membranes and naturally occurring isoantibodies in blood plasma: - Group A: Antigen A on RBCs; anti-B antibody in plasma. - Group B: Antigen B on RBCs; anti-A antibody in plasma. - Group AB: Both Antigen A and Antigen B on RBCs; NEITHER anti-A nor anti-B antibodies in plasma. - Group O: No A or B antigens on RBCs; both anti-A and anti-B antibodies in plasma.
When donor blood is transfused, the critical clinical danger is agglutination and haemolysis of the donor RBCs by antibodies present in the recipient's plasma. Because an individual with blood group AB has zero circulating anti-A and anti-B antibodies, transfused erythrocytes of type A, B, AB, or O encounter no opposing agglutinins, allowing safe transfusion without immune destruction.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Incorrect. Absence of antigens on RBCs defines blood group O (universal donor), not blood group AB.
Incorrect. Antigens are membrane-bound surface proteins/glycolipids on erythrocytes, not plasma solutes.
Incorrect. Antibodies are soluble immunoglobulins in plasma, not surface receptors on RBCs.
Correct. Lacking both anti-A and anti-B antibodies in plasma prevents agglutination of any incoming donor red blood cells.
Options 1 and 2 swap antigens onto plasma or eliminate them from RBCs. Students rushing through the exam frequently read "absence of..." and pick Option 1, inadvertently selecting the feature of blood group O.
"Persons with AB blood group are universal recipients because their plasma lacks both anti-A and anti-B antibodies."
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