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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.
Con: Type O negative carriers will have anti-A and anti-B antibodies against A B, Rh blood group antigens. Thus, a type O individuals can only accept type O blood. Introduction of other types of blood A, B, or AB may cause immune responses and ultimately, death! Type O negative is the rarest, which makes the supply of type O more scarce than other types. Pro: Type O negative is known as the universal donor type. This type of blood can be donated to anyone. Blood group O indivuduals do not have either A or B surface antigens on their red blood cells. Thus, one may donate and save many lives! (and you would really help people with blood O type!)