ABO Groups and Frequencies

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The page below is a sample from the LabCE course ABO Typing Discrepancies. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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ABO Groups and Frequencies

ABO group frequencies vary according to ethnicity. This will be an important fact to consider when working through ABO discrepancy resolution. Table 2 delineates frequencies of ABO occurrences according to ethnic groups.
Table 2. Blood Type Frequency by Ethnicity.1
EthnicityO
A
B
AB
Asian 40% 28% 25% 7%
Black 51% 26% 19% 4%
Caucasian 45% 40% 11% 4%
Hispanic 57% 31% 10% 2%
80% of A individuals are A1, while approximately 20% of A individuals are A2. The same percentages apply to AB individuals; 80% of AB individuals are A1B, while 20% of AB individuals are A2B.
1. American Red Cross. (2021). Facts About Blood and Blood Types. American Red Cross | Blood Services. http://www.redcrossblood.org/learn-about-blood/blood-types.