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[L. transfusio, a pouring out]
1. The collection of blood or a blood component from a donor followed by its infusion into a recipient. In the U.S. more than 14 million blood products are transfused each year.
SEE: intraosseous infusion
2. The injection of saline or other solutions into a vein for a therapeutic purpose.
Transfusions are associated with considerable hazards. These include the risk of allergic reactions, alloimmunization, fluid overload, hemolysis, infection, iron overload, lung injury, and the increased risk of dying from a critical illness.