How does renal dialysis help patients whose kidneys cannot remove wastes from the blood?

Renal dialysis serves as a life-sustaining treatment for patients with kidney failure by performing the essential functions of the kidney when it can no longer filter the blood independently.12

There are two primary methods used to remove waste products like urea and excess salts from the bloodstream:

• Hemodialysis: Blood is diverted from the patient's body through a machine known as an artificial kidney. Inside this device, blood flows along one side of a semipermeable membrane, while a sterile dialyzing fluid flows on the other. Waste products diffuse through the membrane into the fluid, while essential components are retained or added back to the blood.12
• Peritoneal Dialysis: This technique utilizes the patient's own abdominal cavity as a container. Dialysis fluid is introduced into the cavity, where it reaches equilibrium with the blood by absorbing waste products, and is then removed.1

Both methods rely on diffusion and ultrafiltration to maintain the body's acid-base balance and regulate water and electrolyte levels, preventing the accumulation of toxic substances that would otherwise lead to uremia.23