Why your body might need a liquid life support system

Science · Published 25 October 2026 Swipe more like this →

In short: Blood is a complex transport network. Red cells carry oxygen, white cells fight infection, and platelets manage clotting. When these systems fail due to trauma, disease, or surgery, a transfusion becomes a vital medical intervention to restore volume and function to the human body.

A blood transfusion involves transferring blood or its specific components into a recipient's vein. This therapeutic measure is essential for restoring blood or plasma volume following extensive hemorrhage, burns, or trauma. It is also used to treat shock and to increase the concentration of red blood cells in patients with anemia, thereby improving the blood's ability to carry oxygen. Medical professionals can provide different types of blood products depending on the patient's needs. Packed red blood cells are used for anemia, while platelets are vital for patients with low counts or clotting dysfunction. Plasma, which contains essential clotting factors, is used for bleeding disorders or liver disease. In some cases, specialized products like albumin (derived from plasma) or recombinant clotting factor concentrates (genetically engineered replacements) are used to treat specific conditions like hemophilia or severe fluid imbalances. The procedure is highly regulated to ensure safety. Before a transfusion, a blood sample is taken to confirm the donor's blood group is compatible with the recipient. During the process, blood is delivered through sterile tubing, often taking between one and four hours. To prevent clotting during storage, anticoagulants like sodium citrate are added to collection bags. The blood is also tested for infectious agents and kept in a state satisfactory for use through refrigeration and special preservatives.

Blood transfusions restore volume after hemorrhage, burns, or trauma. They treat shock, anemia, sickle cell disease, and thalassaemia.

Blood and plasma transfusions restore volume following hemorrhage, burns, or trauma, and treat shock and anaemia, particularly in sickle cell disease or thalassaemia. Medical professionals provide specific products: packed red blood cells for anaemia, platelets for clotting dysfunction, and plasma for bleeding disorders or liver disease. Specialized products include albumin for shock and recombinant clotting factors for hemophilia. The procedure is highly regulated; compatibility is confirmed via blood samples, and anticoagulants like sodium citrate prevent clotting during the one-to-four-hour delivery.

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