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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.
Therefore those with an O positive blood type have no AB antigens in the blood, but do have an Rh antigen. This is the most common blood type available, and is commonly sought out for donations.lood types also contain a positive or negative mark depending on the presence of the Rhesus or Rh antigen. Those who have Rh markers in the blood have a positive blood type while those who lack Rh will have a negative blood type.