URR Calculator - Urea Reduction Ratio

Your details

Select the unit your lab reports use. mg/dL and mg% are identical for urea.
Blood urea nitrogen measured immediately before the dialysis session begins.
mg/dL
Blood urea nitrogen measured at the end of the dialysis session (post-dialysis sample).
mg/dL
Urea Reduction RatioAdequate dialysis
69.2%

Percentage of urea removed during the dialysis session. Target: 65% or higher.

Estimated Kt/V1.18
Urea removed45mg/dL
69.2 %
Inadequate<55Borderline55-65Adequate65+

URR 69.2% - dialysis adequacy target met.

  • A URR of 69.2% meets the K/DOQI minimum target of 65%. The session removed an adequate amount of urea.
  • The corresponding simplified Kt/V is 1.18, which is below the target of 1.2.
  • URR is a single-pool measure and does not account for fluid removal or residual renal function. Full Daugirdas Kt/V provides a more complete picture.

Next stepContinue monthly URR monitoring as per standard hemodialysis protocols.

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