Multiple choice

Which of the following is a universal blood donor?

  1. A

  2. B

  3. AB

  4. O
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood type O negative is the universal donor because it lacks A, B, and Rh antigens on red blood cells. This means it won't trigger an immune response in recipients with any blood type. Type A, B, and AB all have antigens that would react with incompatible recipients.

Keep practicing — related questions