In medicine, hemodialysis (also haemodialysis) is a method that is used to achieve the extracorporeal removal of waste products such ascreatinine andurea and free water from the blood when the kidney are in a state of renal failure. Hemodialysis is one of three renal replacement therapy (the other two being renal trasplant and peritoneal dialysis). An alternative method for extracorporal separati...