Hawaii Massage License Practice Exam

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Which blood type is considered the universal donor?

  1. A

  2. O

  3. B

  4. AB

The correct answer is: O

The blood type considered the universal donor is O. This designation comes from the fact that individuals with type O blood do not have A or B antigens on the surface of their red blood cells. As a result, their blood can be transfused into any other blood type without causing an immune reaction in the recipient. This is particularly crucial during emergency situations where a recipient's blood type may not be immediately known, making type O blood a vital resource in transfusion medicine. In contrast, blood types A, B, and AB have specific antigens that could provoke an immune response if transfused into someone with a different blood type. Each of these types can only donate to certain compatible types, limiting their use in emergencies compared to type O. Thus, type O blood's unique characteristics make it vital as the universal donor.

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