Dialysis Technician Practice Exam

What type of dialysis uses diffusion, convection, and absorption to remove solutes?

1. Peritoneal dialysis

2. Hemodialysis

3. Continuous renal replacement therapy

4. High flux dialysis

The correct answer is: Hemodialysis

The correct answer is hemodialysis, which employs a combination of diffusion, convection, and absorption to effectively eliminate waste products and excess solutes from the blood. In hemodialysis, blood is drawn from the body and passed through a dialyzer, commonly referred to as an artificial kidney. During this process, diffusion occurs as solutes move from an area of higher concentration in the blood to a lower concentration in the dialysis solution, or dialysate. This principle is essential for removing toxins such as urea and creatinine. Convection, which involves the movement of water and solutes together, enhances the clearance of larger molecules through the use of pressure gradients within the dialyzer. Additionally, abosorption may play a role whereby certain substances in the dialysate can attract and bind specific solutes from the blood, therefore improving the overall efficacy of the treatment. While peritoneal dialysis also relies on diffusion and osmosis, it does not incorporate convection in the same manner as hemodialysis. Continuous renal replacement therapy (CRRT) is typically used in critical care settings and employs different modes, primarily convection and diffusion, but it is not the best answer here due to its specific application characteristics. High flux