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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.
Answers from Ruben A. Mesa, M.D. At one time, type O negative blood was considered the universal blood donor type. This implied that anyone â regardless of blood type â could receive type O negative blood without risking a transfusion reaction. But it's now known that even type O negative blood may have antibodies that cause serious reactions during a transfusion. And blood transfusions in general carry some risk of complications.