ABO and Rh Blood Type
Frequencies in the United States

  ABO Type    Rh Type  How Many Have It 
O positive   37.4%      44% 
O negative 6.6%
A positive 35.7% 42%
A negative 6.3%
B positive 8.5% 10%
B negative 1.5%
AB positive 3.4% 4%
AB negative .6%

(Source: Stanford School of Medicine: Blood Center

 

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Copyright 1999-2012 by Dennis O'Neil. All rights reserved.