There are four possible combinations of blood types namely: Type A (only antigen A), Type B (only antigen B), Type AB (both antigens A and B), and Type O (neither antigens A nor B). This is referred to as the ABO blood typing system. In addition, red blood cells have a Rhesus factor or Rh, which is either present or absent. If the Rh factor is present, the cells are referred to as Rh positive.
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Prepared pursuant to U.S. Army Corps of Engineers Contract DACW31-94-D-0092. The views. expressed here are those of the Logistics Management Institute at the time of issue but not. necessarily those of the U.S. Army Corps of Engineers.