Dialysis Technician Practice Exam

In dialysis, what is the purpose of using a dialysis membrane?

1. To filter excess fluid only

2. To allow the passage of electrolytes only

3. To separate blood from the dialysate

4. To maintain temperature control

The correct answer is: To separate blood from the dialysate

The purpose of using a dialysis membrane is to separate blood from the dialysate. This membrane is a semipermeable barrier that allows only certain substances to pass through while preventing the passage of blood cells and large proteins. During the dialysis process, waste products, electrolytes, and excess fluid diffuse from the blood into the dialysis solution (dialysate) through this membrane. This separation is crucial because it enables the removal of toxins and excess substances from the blood while keeping the blood components intact and preventing contamination from the dialysate. Other options do not accurately capture the primary function of the dialysis membrane. It doesn’t solely filter excess fluid or focus exclusively on the passage of electrolytes and does not have a role in maintaining temperature control. Instead, its main function is to facilitate the exchange of necessary substances while protecting the integrity of the blood.