![]() ![]() In the United States, around 15 million units are transfused annually, while about 85 million units are transfused worldwide. Transfusion of red blood cells has become a relatively common procedure. Transfusion medicine involves laboratory and clinical medicine, and physicians from multiple specialties, such as pathology, hematology, anesthesia, and pediatrics, contribute to the field. This has developed into the field of transfusion medicine. Rapid strides have been made in understanding blood typing, blood components, and storage since the early 1900s. Philip Syng Physick carried out the first human blood transfusion in 1795, and the first transfusion of human blood for treating hemorrhage happened in England in 1818 by Dr. Shortly after that, scientists became interested in transfusion, initially transfusing animal blood into humans. ![]() In the 1600s, William Harvey demonstrated how the circulatory system functioned. ![]() For millennia medicine believed in the "four humors" and used bloodletting as a treatment. Medicine has made significant progress in understanding circulation in the past few hundred years. ![]()
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