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Kidney dialysis.Forearm of an elderly woman patient showing the tubing carrying blood during the procedure of kidney dialysis (haemodialysis). To occupy her during the procedure, the woman embroiders. During haemodialysis, one tube passes blood out of the patient where it is run through an artificial kidney machine (background) to remove waste products from the blood. The cleansed blood is then returned to the patient through the other tube. Haemodialysis is necessary when the kidneys fail to remove waste and excess water from the blood. The procedure takes 2-6 hours and is usually carried out many times a week. An alternative to dialysis is a kidney transplant.
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