For most of human history, the safest thing a doctor could do with blood was take it out. The idea of putting someone else’s blood in would have sounded mad, and for centuries, whenever it was tried, it usually was. The story of how transfusion went from desperation to routine is one of medicine’s great arcs, and it turns on a handful of insights that each made the procedure survivable.
When bleeding was the cure
For over two thousand years, physicians drained blood on purpose. Under humoral medicine, illness meant an imbalance of the body’s fluids, and excess blood was blamed for fevers, inflammation and madness. Bloodletting was mainstream treatment into the nineteenth century, a practice we now know often weakened the very patients it meant to help. The cultural legacy matters: blood was feared as much as valued, and that fear had to be unlearned before transfusion could even be imagined.
The first, terrifying experiments
The first recorded transfusion experiments were animal-to-animal, in England in the 1660s, and soon after, French physician Jean-Baptiste Denis transfused lamb’s blood into a human patient, who, remarkably, survived the first attempt. Later patients were not so lucky, and one prominent death led to transfusion being effectively banned in France. The field went dark for roughly 150 years. When it revived in the 1800s, obstetrician James Blundell in London reasoned correctly that patients should receive human blood, and performed transfusions for women bleeding after childbirth. His results were better, and still a lottery. Some patients transformed; others died of a cause no one could name.
Landsteiner cracks the code
In 1901, Karl Landsteiner, an Austrian immunologist, mixed blood samples from the members of his laboratory and noticed something: in some combinations the red cells clumped together. From those patterns he identified the A, B and O blood groups (AB was described shortly after with colleagues). Suddenly the lottery had an explanation (incompatible blood destroys the recipient’s cells) and a test. For the first time, a transfusion could be predicted safe before it was given. Transfusion went from gamble to procedure, and Landsteiner received the Nobel Prize in 1930. It is hard to overstate the discovery: nearly every safe transfusion since rests on it.
Citrate, depots and the first “blood bank”
Two practical problems remained: blood clotted the moment it left the vessel, and it spoiled fast. Sodium citrate, introduced in the 1910s, solved clotting by safely preventing coagulation, which meant blood could finally be collected, stored and transported rather than moved directly arm-to-arm. During the First World War, Oswald Hope Robertson established a blood depot at a frontline casualty clearing station in 1917, proof that blood could be banked and issued at scale. In 1937, Bernard Fantus at Cook County Hospital in Chicago set up the first hospital blood bank and, with a nod to finance, coined the term itself: “blood bank”.
Blood at World War scale
The Second World War industrialised the idea. Britain, the United States and their allies organised massive volunteer donation programs, shipped plasma (which was easier to transport) to the front, and pioneered dried plasma that could be reconstituted with sterile water at a battlefield. Work associated with Charles Drew on plasma processing and large-scale collection shaped these programs and trained a generation. Blood had become logistics.
Plastic bags, components and safer blood
The late twentieth century brought quiet revolutions: plastic collection bags replaced glass bottles, making closed, sterile separation possible, and centrifuges split each donation into red cells, plasma and platelets, one donor, several patients. Screening for hepatitis and, later, HIV transformed blood from a product with hidden risks into one of the most tested things a hospital handles.
India writes its chapter
India’s own transfusion history runs from scattered early services through a painful era of paid donors and tainted blood to the 1996 Supreme Court order that forced licensing, ended unregulated professional donation and strengthened the National Blood Transfusion Council. That chapter (scandal, reform and the unfinished shift to voluntary donation) is significant enough to have its own story: blood banks in India.
The arc of this history is really one sentence: every generation made transfusion predictable. You can see the result end-to-end in the journey of a blood bag, browse what blood becomes, and if history moves you to join the supply side, register as a donor.