Blood transfusion was the process of receiving blood products into the circulatory system, usually taken from the bloodstream of another individual. (TV: The Blood Line)
Blood transfusion from Jack Harkness made Rex Matheson immortal like him. (TV: The Blood Line)
The Monk mentioned that he would like to give the injured Eldred a blood transfusion, but Wulnoth did not understand what he meant. (TV: "A Battle of Wits")
The First Doctor once had to give the Xing surgeon Aldridge two litres of his TL-positive blood for a surgery. (PROSE: A Big Hand for the Doctor)
The Eighth Doctor once gave the Fourth Doctor a blood transfusion direct from himself. He did so as his former self was dying from blood loss after a Vampire attack. (PROSE: The Eight Doctors)
During the Great War, Dr. Sturgis was experimenting about blood transfusion. Allied with the Doctor's enemies, he threatened the life of the Eighth Doctor by attempting to tranfuse blood into his veins. (AUDIO: The Great War)