What was one significant improvement in blood transfusions during WW1?

The development of methods for storing blood during World War I marked a significant improvement in blood transfusions. Before this period, blood transfusions were often performed directly from donor to recipient, which was limited by the need for immediate use. The war highlighted the necessity for large quantities of blood to treat the numerous injuries sustained on the battlefield.

During WW1, scientists and medical professionals implemented the use of citrate glucose as an anticoagulant, which allowed blood to be stored for longer periods. This advancement made it possible to collect blood from donors and keep it in storage for use when needed, rather than requiring a donor to be present at the time of the transfusion. This innovation greatly expanded the availability and practicality of blood transfusions, ultimately saving numerous lives.

In contrast, the discovery of new blood types primarily occurred before WW1, with Karl Landsteiner's discovery of the ABO blood group system in 1901 being crucial. The use of artificial blood was not yet advanced or common during this time, and while blood donation practices were encouraged, the idea of mandatory blood donation did not take form until later. Thus, the advancement in blood storage methods was a pivotal development that transformed medical practices concerning blood transfusions during and after the war.