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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.
Negative blood types: Only 18% of people in the U.S. have a negative blood type. Yet, when someone with a negative blood type needs blood, only another person with a negative type can save his or her life. O-negative is the universal blood type. This means anyone can receive O-negative blood.