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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.
A-positive, A-negative, B-positive, B-negative, O-positive, O-negative, AB-positive, AB-negative. (The positive or negative refer to the so-called Rhesus factor). Persons with blood type O are so-called universal donors, since they can give blood to anyone having any of the blood types A, B, O or AB. Persons with blood type AB on the other hand, can give blood only to persons with AB blood type.