What is the most common blood group?

Human blood is grouped into four main types (or groups): A, B, AB and O.

Little less than half the population of the planet (about 48%) have type O blood, which makes it the most common group. The blood group of a child is determined by the parents' genes he or she inherits. Antigens are proteins which are found on the surface of red blood cells. In the process of blood type determination, these biomolecules represent the main characteristic criterion. If one has the antigen B on the red blood cells, then he or she has got type B blood.

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102 Comments

Ian MacBrown

Missed that one. I dont know my type but the mosquitos love it.

Patrick Gilmore

O-, get red cross calls regularly. I think people confuse group and type. O is common, O- somewhat rare.

Diane Durante Tsioutsias

Check out the blood connection website. O+ is the most common and O- is the universal donor. http://thebloodconnection.org/about-blood/blood-education/blood-types/o-positive/

leighansmith

I'm O - and a Red Cross donor. I am a universal donor but cannot receive blood from anyone but another O - donor. All 3 of my children are positive , 2 A+ and 1 O+. I had to take a shot after their births to kill the positive traits in my system. Isn't blood fascinating?

namiphi

Ian MacBrown, I'm in the same boat.

bettye

Patrick Gilmore, not rare so much as much in demand. O negative contains nothing that could interfere with the other blood types. For this same reason, an O negative can only receive O negative.

Tracey

Judi Fogle, Yup! I'm AB positive as well. I always say that I won the blood type lottery Universal receiver. :)

Susan Lake-Harris

Gale Em, Not the universal donor for rhesus negative types, but certainly okay for people who are rhesus positive. Only O- can be given to anyone, whether positive or negative rhesus factor.