Certified Dialysis Nurse Practice Test 2025 – All-in-One Resource for Exam Success!

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Which substance is primarily removed from the blood during dialysis?

Creatinine

Urea

The primary substance removed from the blood during dialysis is urea. Urea is a waste product formed from the breakdown of proteins in the body, and it is typically eliminated by healthy kidneys. In individuals with renal failure, the kidneys are unable to effectively filter out urea from the bloodstream, leading to an accumulation that can cause various health issues. Dialysis acts as an artificial means of filtration, helping to remove urea along with other waste products, maintaining a safer balance of chemicals in the body.

While creatinine, potassium, and phosphorus are also relevant in the context of dialysis, urea stands out as the primary target for removal. Dialysis sessions are often monitored for urea levels specifically to assess the effectiveness of the treatment. The reduction of urea levels is crucial, as its accumulation is directly linked to the effects of kidney dysfunction on overall health.

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Potassium

Phosphorus

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