4 doctors weighed in:
What is the biggest blood type in the world?
4 doctors weighed in

Dr. Peter Kurzweil
Internal Medicine
3 doctors agree
In brief: O+ and A+
Generally, there is the ABO blood group system (a, b, or ab), and the rh system (+ or --).
When in different combinations, each person is one of 8 types. The % of each type varies from country to country. But if take the whole world, i believe 0 positive is most common, a positive next most common (about 2/3). Ab negative is the rarest. O-- is the universal donor. Ab+ is the universal receiver.

In brief: O+ and A+
Generally, there is the ABO blood group system (a, b, or ab), and the rh system (+ or --).
When in different combinations, each person is one of 8 types. The % of each type varies from country to country. But if take the whole world, i believe 0 positive is most common, a positive next most common (about 2/3). Ab negative is the rarest. O-- is the universal donor. Ab+ is the universal receiver.
Dr. Peter Kurzweil
Dr. Peter Kurzweil
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