All About Blood Types

6. Transfusions

There are many reasons for blood transfusions. Blood loss from injuries or surgeries can result in significant blood loss, after which it can take the human body weeks to replace the lost red blood cells fully. A blood transfusion can replace the lost blood more quickly, keeping blood quantity at a healthy level. However, some blood types can’t receive transfusions of other blood types -- this will trigger an immune system response that could increase the danger. This is why physicians always check blood types and ensure compatibility before beginning a transfusion.