Which of the following blood groups is considered the universal donor in human blood transfusion?

💡 Solution & Explanation

O negative red blood cells lack A, B, and Rh antigens on their surface membrane, meaning they do not trigger an immune response when infused into recipients of other blood groups. Conversely, AB positive individuals are considered universal recipients because their plasma lacks antibodies against A and B antigens. Blood typing prevents fatal agglutination reactions during emergency medical transfusions.