MICHAEL DONNE / SCIENCE PHOTO LIBRARY MICHAEL DONNE / SCIENCE PHOTO LIBRARY
Kidney dialysis. Blood flowing down a tube from the forearm of a patient during haemodialysis. The blood is passed through a dialysis machine, which acts as an 'artificial kidney' to remove waste products and excess fluid from the blood. The filtered blood is then returned through a separate tube into the patient's body. This cleaning of the blood is usually done by the kidneys. If they are damaged, waste products build up in the blood, which can be fatal. Haemodialysis takes between 2 and 6 hours and must be carried out several times a week.
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