lol0902
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Im slightly confused on the concept of Universal donor blood...
So I understand that O negative is the universal donor because it has no antigens on its surface which means no matter which body it is put into antibodies from any blood group won't be able to attack it because it doesn't have any antigens, however....
Im slightly confused because O group blood has A and B antibodies, so although nothing can affect the O group blood itself if it got put into someone with A group blood wouldn't the A antibodies from the O group blood attack the blood cells from A blood group?
Hope that sorta makes sense... its very wordy haha
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MargotP
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Kinda confusing lol

O is a universal donor and has no antigens on its surface - therefore allowing it to be introduced into anyone’s bloodstream because no matter what blood group the receiving person has, the receptors in the new blood will accept them.
However, O has A and B antibodies, meaning that if someone with A antigens, donated blood to a person with the O blood, the O antibodies would come in to ‘fight’ off the A antigens.

Depends who’s on the receiving end!
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Apachecow
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I find it easier to think about it in terms of the body doesn't (usually) produce antibodies against itself. So A blood group had anti B antibodies but no anti A ones or it would attack itself.

Group O doesn't display A or B and therefore already has A and B antibodies.

https://en.wikipedia.org/wiki/Blood_...blood_type.svg
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