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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.
Group AB is a universal recipient. This is the rarest blood type which can receive blood from O, A, B and AB. Group O negative (-) is a universal blood donor. This blood can donate blood to O. A, B and AB. Group AB positive (+) is a universal plasma donor.