Certified Dialysis Nurse Practice Test

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What does the term "ultrafiltration" refer to in the context of dialysis?

The process of removing excess fluid from the blood

Ultrafiltration in the context of dialysis refers to the process of removing excess fluid from the blood. This is a critical function of dialysis, especially in patients with kidney failure, where the kidneys are unable to effectively remove excess water and waste products from the bloodstream. During dialysis, a semipermeable membrane is used to create a pressure gradient that helps to pull out fluid from the blood into the dialysis solution, thereby helping to maintain fluid balance in the body. This process is essential for preventing complications associated with fluid overload, such as hypertension and edema.

While the other options mention important aspects of dialysis care, they do not specifically define ultrafiltration. Adding nutrients or balancing electrolytes are processes that may occur during dialysis but are secondary to the primary role of ultrafiltration in addressing fluid overload.

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The method of adding nutrients to the blood

The technique for filtering waste products through a membrane

The process of balancing electrolytes in the blood

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