Health encyclopaedia

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Blood transfusion

Blood transfusion means taking blood from one person and giving it to another. Blood transfusions are needed to replace blood lost in accidents and after surgery, as well as to treat conditions such as anaemia. Hospitals rely on a bank of blood donations to enable them to carry out life-saving operations. 

Blood is needed to carry oxygen and nutrients to all the organs of the body. It also takes away waste products. The blood recognises antigens (foreign substances) and produces antibodies to fight them off. If the skin is cut or scratched, the blood clots together to prevent bleeding. Blood is essential to life; if our organs do not receive oxygen and nutrients, they shut down and we die.

• When should it be done?
• What is it used for?
• How does it work?
• Risks
• References
• Why is it necessary?
• How is it performed?

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