Urea Reduction Ratio (Hemodialysis)
Info
Urea pre Hemodialysis
unit mg/dL mmol/L
Urea post Hemodialysis
unit mg/dL mmol/L
R e s u l t s
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Info
Urea Reduction Ratio (Hemodialysis)

Hemodialysis is a life-sustaining procedure for the treatment of

patients with end-stage renal disease. A Hemodialysis dose is worked out for patients by comparing the levels of waste such as urea or creatinine in the patient's blood. 

Urea Reduction Ratio is a way of comparing urea levels in the blood before and after dialysis.

 

 

The formula used is:

URR = [1 - (UPostHD / UPreHD)]

Where

  • UPreHD = Urea pre Hemodialysis
  • UPostHD = Urea post Hemodialysis
  • URR = Urea Reduction Ratio

* Note units must match to be either mg/dL or mmol/L for both the urea pre and post dialysis.

 

This information helps interpreting adjustments to be made for future Hemodialysis sessions.

 

Interpretation:

Urea Reduction Ratio should be >65% per session.

Reference:

Owen WF Jr, et al. The urea reduction ratio and serum albumin concentration as predictors of mortality in patients undergoing hemodialysis. N Engl J Med. 1993 Sep 30;329(14):1001-6.

Daugirdas JT. Second generation logarithmic estimates of single-pool variable volume Kt/V: an analysis of error. J Am Soc Nephrol. 1993 Nov;4(5):1205-13.