NHS writes: 'A blood transfusion is when you're given blood from someone else (a donor). It's a very safe procedure that can be lifesaving.'A blood transfusion may be needed if you have a shortage of red blood cells.'This may be because your body's not making enough red blood cells or because you have lost blood.'For example, you may need a blood transfusion if you have'a condition that affects the way your red blood cells work – such as sickle cell disease or thalassaemia'a type of cancer or cancer treatment that can affect blood cells – including leukaemia, chemotherapy or stem cell transplants'severe bleeding – usually from surgery, childbirth or a serious accident'A blood transfusion can replace blood you have lost, or just replace the.
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