Certified Dialysis Nurse Practice Test 2025 - Free Dialysis Nurse Practice Questions and Study Guide

In peritoneal dialysis, the primary role of the dialysis solution is to absorb toxins and excess substances from the bloodstream through the peritoneal membrane. This solution is a sterile fluid that is instilled into the peritoneal cavity, where it interacts with the blood vessels in the peritoneum. The osmotic and diffusion principles allow waste products, such as urea and creatinine, as well as excess electrolytes and fluids, to migrate from the blood into the dialysis solution. Therefore, during the dwell time, the solution effectively removes unwanted substances from the body, thus facilitating a cleansing process that is essential for patients with renal failure.

Other choices relate to functions that are not accurate in the context of peritoneal dialysis. While cleansing the blood of toxins is an outcome of the process, it is specifically the dialysis solution that absorbs these toxins rather than directly cleansing the blood itself. Providing nutrients is not a function of the dialysis solution; in fact, the focus is on removing waste and excess substances, not adding anything beneficial for nutritional support. Monitoring blood pressure is unrelated to the function of the dialysis solution, as this involves separate clinical procedures and assessments.