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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1 GCSS-ARMY.. 2  Retrieved October 10 2015 from http://www.acronymfinder.com/Global-Combat-Support-System-_-Army-(GCSS_ARMY).html. 3  APA style: GCSS-ARMY. (n.d.) Acronym Finder. ( 4 2015). 5  Retrieved October 10 2015 from http://www.acronymfinder.com/Global-Combat-Support-System-_-Army-(GCSS_ARMY).html.