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the blood group o does not have any antigen for other blood groups so it does not cause any immunological problem that is why it can transfuse universally. Donors of Blood group O were always referred to as 'universal donors.' Today, because of new research and a better understanding of the complex issues regarding immune reaction related to incompatible donor Blood cells, type O Blood is no longer automatically seen as being suitable in most every case.

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14y ago
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11y ago

Because it has A, B and O antigen.

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Q: Why is blood group 'O' a universal donor?
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Related questions

Is a person with blood type O a universal donor?

Yes, A person having O +ve blood group is universal donor


What is the unversal donor blood type?

Type O negative.


Is O plus Universal Donor?

No it is not..The blood group is O negative.


is A positive blood a universal donor type?

O negative is the universal donor because when O+ve blood group is transfused to -ve blood group recipient, antibodies are produced which causes hemolysis of Rh +ve labelled blood cells. When O-ve blood is transfused to Rh +ve recipient, no antibodies are produced as donor blood has no Rh factor present on blood cells, so no transfusion reaction occurs. Thus, O -ve is universal donor.


What is the name of a blood group o person?

Universal donor


Can a person with O blood group donates his blood to an A blood group?

O Rh- is the universal donor and AB Rh- is the universal recipient of all blood types.


Can an individual with o blood group donates his blood to a blood group person?

O Rh- is the universal donor and AB Rh- is the universal recipient of all blood types.


Name for blood group O person?

A blood group 'O' person is called a Universal Donor from sue b :-)


Which blood group is the universal donor?

Group O is the universal donor. The downside for people with type O blood is that although their blood can go to anyone with any type (A,B, or O), they can only receive type O for themselves. Luckily, O is common.


Who donates to O negative blood group?

No-one because it is a universal blood donor. :)


What is the universal donor in terms blood transfusion?

blood group O because it have no antigen.


Is o plus also a universal donor?

O plus is called universal blood donor. Because O plus blood has anti A and anti B antibody. So it will not react with any blood group.