"Give me 4 units of O-neg, stat!" Michael Davis, MD, pediatrician, discusses blood types, transfusions and compatibility of blood products in children.
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Dr. Davis: Human blood can be divided in to four types, A, B, AB, and O. Determining the blood type is important before receiving donated blood cells or organs. Combining at non-matching blood types may cause the blood to clot together. These clots ca