Dialysis Technician Practice Exam

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Which tests are required to determine the amount of urea removed during dialysis?

Pre-BUN, Post-BUN, URR
Urinalysis, BUN, Creatinine
Electrolytes, Pre-BUN, URR
Complete Blood Count, Post-BUN, Dialysate

The correct answer is: Pre-BUN, Post-BUN, URR

The determination of the amount of urea removed during dialysis relies primarily on measuring blood urea nitrogen (BUN) levels before and after the dialysis session. The pre-dialysis BUN reflects the urea concentration in the bloodstream before treatment, while the post-dialysis BUN shows the concentration after the dialysis process has occurred. The difference between these two measurements is critical in assessing the effectiveness of the dialysis in removing urea. Additionally, the Urea Removal Ratio (URR) is a calculated value that provides a further measure of dialysis efficacy, quantifying the percentage reduction in BUN as a result of the dialysis treatment. It is typically calculated using the formula: URR = (Pre-BUN - Post-BUN) / Pre-BUN x 100. This metric is important for evaluating the overall performance of the dialysis treatment and ensuring that sufficient urea is being cleared from the patient’s blood. The combination of pre-BUN, post-BUN, and URR measurements provides a comprehensive assessment of urea removal, making them essential tests in the dialysis process.