What is a transfusion?

A transfusion is specifically defined as the transfer of blood from one person to another. This medical procedure involves taking whole blood or blood components, such as red blood cells, platelets, or plasma, from a donor and infusing them into a recipient's bloodstream. Transfusions are crucial for treating various medical conditions, including severe anemia, trauma, and surgical blood loss, among others.

The other options describe different processes: the removal of blood from the body is known as phlebotomy, a technique for blood sampling refers to taking blood samples for diagnostic purposes without the intent of delivering it into another person, and a method for producing blood cells typically involves medical treatments or therapies aimed at stimulating the body's own production of blood cells, rather than directly transferring them from one individual to another.