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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.
In theory, type O blood is the universal donor. It can donate to A, B, or AB. In reality, things are more complicated, and you can't really say what type of blood O can donate â¦ to, not without doing some lab tests on the specific blood (donor and recipient both).