Percentage distribution of blood types and Rh factor can change from one ethnic group or race to another but statistically speaking the rarest (least common) blood types are AB Rh negative and B Rh negative.
Blood Type
Abbr
% Frequency
O Rh-positive
O+
38%
O Rh-negative
O-
7%
A Rh-positive
A+
34%
A Rh-negative
A-
6%
B Rh-positive
B+
9%
B Rh-negative
B-
2%
AB Rh-positive
AB+
3%
AB Rh-negative
AB-
1%
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