How to Calculate Your URR

For those on dialysis, URR is an important number. URR stands for urea reduction ratio, which is a test of how successful a series of dialysis sessions have been in the reducing urea in the body. The URR is calculated from the results of blood urea nitrogen (BUN) tests, which measure urea-produced nitrogen in the blood, and, according to the National Kidney Urologic Diseases Information Clearinghouse, should be performed every twelve to fourteen treatments. The URR helps gauge a treatment's efficacy.

Instructions

• 1

  Subtract the BUN test results taken after dialysis from the test results taken from before dialysis. For example, if the post-dialysis number is 90 and the pre-dialysis number is 30, subtracting 30 from 90 to reach 60.

• 2

  Divide the difference calculated in the previous step by the BUN results post-dialysis. For this example, 60 divided by 90 equals 2/3 or 0.6667.

• 3

  Multiply the quotient from the previous step by 100 to calculate the URR. For this example, 0.6667 multiplied by 100 equals 66.67. The URR is 66.67 percent, which is adequate since it is meets the recommended minimum of 65 percent.