An extracorporeal ultrafiltration technique applied to patients with acute renal failure whereby blood is cleansed by first removing it from the body and filtered through a system of extracorporeal filters. Waste products, toxins and non-cellular water are removed and substituted by a replacement solution infused into the extracorporeal circuit before the blood is finally returned into the body.
Hemofiltration is different from a related technique, hemodialysis. Hemofiltration involves the convective removal of wastes while hemodialysis involves diffusion in dialysis. In hemofiltration, the blood is pumped through a hemofilter or a dialyzer similar in dialysis, but no dialysate is used.
Word origin: Greek haîma (blood)