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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 person with an A+ (positive) blood type can receive blood types A and O (A+, A-, O+, and O). Moreover, type AB is considered the universal recipient blood type because type AB individuals can receive all blood types (and is the only blood type that can accept type AB blood). Type O blood is considered the universal donor blood type because type O blood is accepted by all blood types.