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The classic blood typing into groups A, B, AB or O is only one way to divide up the population. Also whether you are rhesus negative or positive can play a big part. If you are type O but rhesus positive, your blood cannot be given to someone type O but rhesus negative or their immune system will react to the rhesus part of the donated blood.

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Q: Why is blood group O not always 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 name of a blood group o person?

Universal donor


What is the unversal donor blood type?

Type 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 universal donor and recipient?

Blood group O is known as the "universal donor" because it has no antigens on its red blood cells and can therefore be safely given to any blood group. Blood Group AB is known as the "universal recipient" because it has no antibodies in its plasma and so can safely receive blood from any other blood group.


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.


Is O plus Universal Donor?

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


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.


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 :-)


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.