Approximately 36,000 pints of blood are used in transfusions every single day in the United States, saving the lives of countless patients who have endured trauma, surgery, or illness. But in recent years, evidence has emerged that these transfusions all come with more risk than doctors originally thought.

Approximately 36,000 pints of blood are used in transfusions every single day in the United States, saving the lives of countless patients who have endured trauma, surgery, or illness. But in recent years, evidence has emerged that these transfusions all come with more risk than doctors originally thought.