Which blood group is generally considered the universal red blood cell donor group when emergency cross-matching is not available?
Correct answer: D. O negative
- A. A positive
- B. B negative
- C. AB positive
- D. O negative
Explanation
O negative red blood cells lack A, B and Rh D antigens, so they are less likely to cause an immediate reaction in an unknown recipient. Compatibility testing should still be performed as soon as possible because emergency uncrossmatched blood has risks.
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About Blood and Immunity
Blood and immunity covers plasma, red blood cells, white blood cells, platelets, haemoglobin, blood groups and haemostasis. It explains innate and adaptive defenses, antibodies, lymphocytes, inflammation, vaccination and immune memory, with a distinction between active and passive immunity and between antigen and antibody.
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