Hemodialysis Hemodialysis which is also spelled as haemodialysis, is generally called as kidney dialysis or dialysis simply, it is a procedure of purifying the blood of a person whose kidneys are not functioning properly. This type of dialysis attains the extracorporeal removal of useless products like urea and creatinine and the free water from blood when the kidneys are in a condition of failure. Hemodialysis is one of the three renal replacement therapies (the two other are peritoneal dialysis and kidney transplant). It is an another method for extracorporeal separation of blood components like cells or plasma is apheresis. This procedure can be done in an inpatient or outpatient therapy. Regular hemodialysis is carried out in a dialysis outpatient facility, in either a separate room in a hospital or an exclusive stand alone clinic. How does hemodialysis work? The dialyzer is essential for hemodialysis. The dialyzer is called as the artificial kidney since it is aimed towards filtering the blood, same job as kidney used to do. The dialyzer is an empty tube which is about foot long and there are three inches in diameter which contains many tiny filters.