Which specific blood group is designated as the universal donor because red blood cells lack both A and B surface antigens?

💡 Solution & Explanation

Blood group O negative red blood cells lack A, B, and Rh surface antigens, preventing immune attack when transfused into recipients of any other blood group. Individuals with AB positive are universal recipients because their plasma contains no antibodies against A or B antigens. Cross-matching prevents transfusion reactions in clinical practice.