Changes

The International Society of Blood Transfusion (ISBT) recognises 29 blood grouping systems<ref>{{cite web |url=http://blood.co.uk/ibgrl/ISBT%20Pages/ISBT%20Terminology%20Pages/Table%20of%20blood%20group%20systems.htm |title=Table of blood group systems |accessdate=2008-01-01 |year=2007 |month=September |publisher=International Society of Blood Transfusion }}</ref>, among which the best know are the ABO and Rhesus systems.  

The International Society of Blood Transfusion (ISBT) recognises 29 blood grouping systems,<ref>{{cite web |url=http://blood.co.uk/ibgrl/ISBT%20Pages/ISBT%20Terminology%20Pages/Table%20of%20blood%20group%20systems.htm |title=Table of blood group systems |accessdate=2008-01-01 |year=2007 |month=September |publisher=International Society of Blood Transfusion }}</ref> among which the best know are the ABO and Rhesus systems.  

Many people will know their blood type in terms of these systems, and some have this [[tattoo]]ed on their body. Hospitals will always test before giving blood; however, in an emergency, "universal donor" (O neg) blood may be administered before the tests confirm a person's blood type.

Many people will know their blood type in terms of these systems, and some have this [[tattoo]]ed on their body. Hospitals will always test before giving blood; however, in an emergency, "universal donor" (O neg) blood may be administered before the tests confirm a person's blood type.

==External links==

==External links==

* [http://www.washtimes.com/national/20070404-122704-3244r.htm Breakthrough makes all blood types universal] - Joyce Howard Price, ''[[The Washington Times]]'' - April 4, 2007

* [http://www.washtimes.com/national/20070404-122704-3244r.htm Breakthrough makes all blood types universal] - Joyce Howard Price, ''[[The Washington Times]]'' - April 4, 2007

* [http://www.iccbba.org ICCBBA and ISBT 128]

* [http://www.iccbba.org ICCBBA and ISBT 128]