Certified Clinical Hemodialysis Technician (CCHT) Practice Exam 2025 – The All-in-One Guide to Exam Success!

The correct answer is that the dialysate compartment surrounds the fibers in a dialyzer. In hemodialysis, the dialyzer serves as a filtration unit where blood and dialysate flow in separate compartments. The fibers within the dialyzer are where diffusion and ultrafiltration of waste products and excess fluids occur. Blood flows through these hollow fibers, while the dialysate flows around them in the dialysate compartment. This setup allows for effective removal of toxins and excess products from the blood as they pass through the fibers while being in contact with the dialysate solution.

The other compartments mentioned do not surround the fibers. The blood compartment refers to the area where the patient’s blood is transported through the fibers, while the air compartment is not relevant to the operation of a dialyzer in hemodialysis. The filtrate compartment does not exist as a separate entity in the context of how a dialyzer functions, further emphasizing the uniqueness of the dialysate compartment’s role in the dialyzer’s operation.