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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FACS is an acronym for Fellow of the American College of Surgeons, an indication that the bearer of such a title is a member of the American College of Surgeons (ACS).any doctors and other medical professionals have a string of abbreviations after their names to indicate their credentials, areas of specialization and certifications. Most of us recognize M.D. and D.D.S. as medical doctor or doctor of dental surgery..