Certified Hemodialysis Technician Practice Exam 2026 – All-in-One Guide to Exam Success

The Three-pore Model (TPM) is specifically utilized to describe the transport mechanisms of solutes and water across the peritoneal membrane during peritoneal dialysis. This model focuses on the function of three distinct types of pores within the membrane, which facilitate the movement of solutes such as sodium and water. It emphasizes how the size and charge characteristics of these pores impact the permeability of various substances. By illustrating how different solutes pass through these pores, the model provides valuable insights into the efficiency of fluid and electrolyte removal during dialysis treatments.

While oxygen diffusion and carbon dioxide elimination are critical processes within the body, they are not the focus of the Three-pore Model. Similarly, protein absorption is a different physiological process that does not directly correlate with the specific mechanisms of solute and water transport across the peritoneal membrane described by the TPM. Thus, the correct identification of sodium and water removal in the context of peritoneal dialysis as per the Three-pore Model helps establish a clearer understanding of how dialysis therapies operate to manage fluid and electrolyte balance in patients with renal failure.