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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.
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.ven then, small samples of the recipient's and donor's blood are mixed to check compatibility in a process known as crossmatching. In an emergency, however, type O negative red blood cells may be given to anyone â especially if the situation is life-threatening or the matching blood type is in short supply.