Skip to Content
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
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
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 MedicineSpecialist Medical ReviewerTushar J. Vachharajani, MD, FASN, FACP - Nephrology
Current as ofNovember 14, 2014
Current as of:
November 14, 2014
Anne C. Poinier, MD - Internal Medicine & Tushar J. Vachharajani, MD, FASN, FACP - Nephrology
To learn more about Healthwise, visit Healthwise.org.
© 1995-2015 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
© Copyright 2016 Rush-Copley Medical Center • 2000 Ogden Avenue; Aurora, IL 60504
Main: 630-978-6200 • Physician Referral & Information: 630-978-6700 or 866-4COPLEY (866-426-7539)