Hemoperfusion or
haemoperfusion (see spelling differences) is a method of filtering the
blood extracorporeally (that is, outside the body) to remove a
toxin. As with other extracorporeal methods, such as
hemodialysis (HD),
peritoneal dialysis (PD),
hemofiltration (HF), and
hemodiafiltration (HDF), the blood travels from the patient into a machine, gets filtered, and then travels back into the patient, typically by venovenous access (out of a
vein and back into a vein).