Which human blood type is considered the universal red blood cell donor because its erythrocytes lack both A and B surface antigens?
Answer and explanation
Correct answer: D. Type O negative
- Step 1: Type O negative red blood cells carry neither A nor B agglutinogens on their erythrocyte membranes and lack the Rh(D) antigen.
- Step 2: Consequently, they can be transfused in emergency settings without provoking ABO or Rh hemolytic reactions in the recipient.
Answer
Type O negative.
Why not the others: 'Type AB positive' is the universal plasma and universal recipient, carrying both A and B antigens; 'Type A positive' carries A and Rh antigens; 'Type B negative' carries B antigen.
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