Blood | MedlinePlus
https://medlineplus.gov/blood.html
WEBMay 11, 2023 · There are four blood types: A, B, AB, or O. Also, blood is either Rh-positive or Rh-negative. So if you have type A blood, it's either A positive or A negative. Which type you are is important if you need a blood transfusion.
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