What is the most common blood type?

This is an average distribution of the blood types in the United States. The distribution may be different for specific ethnic groups: 

  • O Rh-positive - 38 percent 
  • O Rh-negative - 7 percent 
  • A Rh-positive - 34 percent 
  • A Rh-negative - 6 percent 
  • B Rh-positive - 9 percent 
  • B Rh-negative - 2 percent 
  • AB Rh-positive - 3 percent 
  • AB Rh-negative - 1 percent 










What is the most common blood type? | San Diego Blood Bank

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