Human Blood Type Distribution: Global Percentages and Prevalence

Approximate worldwide ABO and Rh blood type frequencies:

Blood Type	Percentage
O positive	37.4%
A positive	35.7%
B positive	8.5%
AB positive	3.4%
O negative	6.6%
A negative	6.3%
B negative	1.5%
AB negative	0.6%

Note: These percentages vary by ethnicity and geographic region. For example, type B is more common in Asian populations, while O negative is higher in Basque and certain Native American groups. Always refer to local blood donor registries for area‑specific data.