What is the definition of haemodialysis?

Haemodialysis is a medical treatment that involves using special filters, called dialyzers, to remove waste products, excess fluid, and toxins from the blood when the kidneys are unable to perform these functions effectively. This process is essential for individuals with kidney failure or severe renal impairment, as it helps to maintain a proper balance of electrolytes and fluid in the body, thereby preventing complications associated with renal dysfunction.

The procedure typically involves circulating the patient's blood through these filters, where the waste and excess fluids are removed, and the purified blood is then returned to the patient’s body. This method provides a crucial support while alternative treatments, such as kidney transplant or conservative management, are considered.

Options that suggest complete replacement of kidney function, surgical procedures, or methods of medication delivery do not accurately describe the specific function or operation of haemodialysis, which focuses solely on the filtration and purification of blood rather than entirely replacing kidney processes or delivering medications.