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Results 1 - 1 of 1 for BLOOD "GROUP," RH SYSTEM
  1. Blood (National Library of Medicine)  
    ... blood types: A, B, AB, or O. Also, blood is either Rh-positive or Rh-negative. So if you have ... you are is important if you need a blood transfusion. And your Rh factor could be important if you become pregnant - ...
    https://medlineplus.gov/blood.html - Health Topics