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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.
Over 100 years ago, it was discovered that people have different types of blood. The major types are O, A, B and AB. For a blood donation to be helpful to a patient, there has to be an appropriate match between the blood type of the donor and that of therecipient. Some types happily mix, while others do not. The common Type O can be safely transfused to patients with O, A, B or AB blood, but Type O patients can only receive blood from other Type O people. Each major blood group is divided into Rh negative or positive types. On average, 45% of the population is Type O, 40% Type A, 10% Type B, and 5% Type AB. Check the chart to see where you fit in. Is Your Blood Type Rare?