Centre-based haemodialysis usually takes place in a hospital or 'satellite' dialysis unit. It is more common to have haemodialysis in a dialysis unit than it is to undergo dialysis at home.
During haemodialysis, needles are used to access you blood. This can be done by using a fistula, graft, or tube placed in a large vein. Once the needles have been put in place, blood will flow from your body and into the dialysis machine, where your blood will be cleaned. The clean blood is then returned to your body (via a different tube and needle).
About 200 mL, or approximately 1 cup, of your blood is out of your body at any given time.