What is the primary purpose of dialysis?

What is the primary purpose of dialysis?

• A. Increase red cell mass.
• B. Produce erythropoietin.
• C. Correct metabolic alkalosis.
• D. Remove waste products and excess fluid from the blood when the kidneys are unable to perform these functions.

Answer: (D)

Dialysis substitutes kidney function by removing waste products and excess fluid from the blood when the kidneys can’t. It clears toxins like urea and creatinine (through diffusion) and removes fluid (through ultrafiltration), helping restore volume and electrolyte balance. Dialysis can also help correct acid–base disorders with the bicarbonate in the dialysate, but its primary role is cleansing the blood and managing fluid status, not increasing red cell mass or stimulating erythropoietin production. Erythropoietin is produced by the kidneys and promotes red blood cell production, which is addressed with EPO therapy and iron. So the main purpose is to remove waste and excess fluid when kidneys can’t do it.

Dialysis substitutes kidney function by removing waste products and excess fluid from the blood when the kidneys can’t. It clears toxins like urea and creatinine (through diffusion) and removes fluid (through ultrafiltration), helping restore volume and electrolyte balance. Dialysis can also help correct acid–base disorders with the bicarbonate in the dialysate, but its primary role is cleansing the blood and managing fluid status, not increasing red cell mass or stimulating erythropoietin production. Erythropoietin is produced by the kidneys and promotes red blood cell production, which is addressed with EPO therapy and iron. So the main purpose is to remove waste and excess fluid when kidneys can’t do it.