Cuci darah; proses pemisahan ion atau zat berberat molekul rendah dari darah melalui proses difusi pada membran semi-permeabel.

Merriam-Webster Online Dictionary
dialysis (noun)
the separation of substances in solution by means of their unequal diffusion through semipermeable membranes , especially such a separation of colloids from soluble substances
the process of removing blood from an artery (as of a kidney patient), purifying it by dialysis, adding vital substances, and returning it to a vein - called also hemodialysis
Dialysis (Wikipedia)
This article is about renal dialysis. For the laboratory technique, see Dialysis (biochemistry). For treatment for liver failure, see Liver dialysis.
Patient receiving dialysis 03.jpg
Patient receiving hemodialysis
ICD-9-CM 39.95
MeSH D006435
MedlinePlus 00743

In medicine, dialysis (from Greek διάλυσις, diàlysis, meaning dissolution, διά, dià, meaning through, and λύσις, lỳsis, meaning loosening or splitting) is a process for removing waste and excess water from the blood and is used primarily as an artificial replacement for lost kidney function in people with kidney failure. Dialysis may be used for those with an acute disturbance in kidney function (acute kidney injury, previously acute renal failure) or progressive but chronically worsening kidney function—a state known as chronic kidney disease stage 5 (previously chronic kidney failure or end-stage renal disease). The latter form may develop over months or years, but in contrast to acute kidney injury is not usually reversible and dialysis is regarded as a "holding measure" until a kidney transplant can be performed or sometimes as the only supportive measure in those for whom a transplant would be inappropriate.

The kidneys have an important role in maintaining health. When healthy, the kidneys maintain the body's internal equilibrium of water and minerals (sodium, potassium, chloride, calcium, phosphorus, magnesium, sulfate). The acidic metabolism end-products that the body cannot get rid of via respiration are also excreted through the kidneys. The kidneys also function as a part of the endocrine system, producing erythropoietin, calcitriol and renin. Erythropoietin is involved in the production of red blood cells and calcitriol plays a role in bone formation. Dialysis is an imperfect treatment to replace kidney function because it does not correct the compromised endocrine functions of the kidney. Dialysis treatments replace some of these functions through diffusion (waste removal) and ultrafiltration (fluid removal).