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Best Answer: O positive ok for transfusing to all positive types. O negative is a unversal to all types. So you cannot donate blood for an O negative if you are O positive. If you just want to donate plasma then you can donate, just not whole blood.
Donors with type O- red blood cells are referred to as universal donors and their red blood cells can be given to any other blood type. Donors with type AB+ are referred to as universal recipients and can receive red blood cells from any other blood type. Donors with type AB- are universal plasma donors and can give plasma to any other blood type.