Universal blood donor type: Is there such a thing? - Mayo
Dec 02, 2020 · Type A; Type B; Type AB; Type O; Blood is also classified by rhesus (Rh) factor. If your blood has the Rh factor, you're Rh positive. If your blood lacks the Rh factor, you're Rh negative.. Ideally, blood transfusions are done with donated blood that's an exact match for type and Rh factor. Even then, small samples of the recipient's and donor's blood are mixed to check compatibility in a ...
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