Blood transfusions are very common. Each year, almost 5 million Americans need blood transfusions. The procedure is used for people of all ages.
Some people who have surgery need blood transfusions because they lose blood during their operations. People who have serious injuries—for example, from car crashes, war, or natural disasters—also may need blood transfusions to replace blood lost during the injury.
Some people need blood or blood parts because of illnesses. For example, blood transfusions might be used to treat:
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