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removes urea and other waste products from the blood. To find out how well dialysis is working, you will have blood tests that look at the level of urea in your blood. Usually these tests are done once a month, at the beginning of your session and again at the end. Two measures show how well dialysis is working: urea reduction ratio (URR) and Kt/V.
One way to measure how well hemodialysis is removing urea from the body is to measure blood urea nitrogen (BUN) level. The BUN is measured before and after your treatment session. Then the two numbers are compared to see how much the urea level in the blood has decreased. This difference is called the urea reduction ratio (URR), and it is usually expressed as a percentage. An adequate dose of hemodialysis should result in an average URR of 65%.
Another way to measure the effectiveness of hemodialysis is to compare the amount of fluid that is cleared of urea during each dialysis session with the amount of fluid that exists in the body. This is called the Kt/V.
The Kt/V is the most accurate measure of hemodialysis, because it also measures the amount of urea removed with excess fluid and takes into consideration other factors, such as weight loss during dialysis. An adequate dose of hemodialysis should result in an average Kt/V of 1.2.
An adequate dose of dialysis can usually be delivered in 3 to 5 hours.
ByHealthwise StaffPrimary Medical ReviewerAnne C. Poinier, MD - Internal MedicineAdam Husney, MD - Family MedicineKathleen Romito, MD - Family MedicineSpecialist Medical ReviewerTushar J Vachharajani, MD, FASN, FACP - Nephrology
Current as ofMarch 15, 2018
Current as of:
March 15, 2018
Anne C. Poinier, MD - Internal Medicine
& Adam Husney, MD - Family Medicine & Kathleen Romito, MD - Family Medicine & Tushar J Vachharajani, MD, FASN, FACP - Nephrology
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