Residual Renal Function in Hemodialysis Patients (Kru)

ID Urine Vol
Urine Urea Conc
ID Period
Mean BUN
Decimal Precision:
MeanBUN = (U1 + U2) / 2
RRF = IDUrineVol * UrineUreaConc / IDPeriod / MeanBUN
  • U1 is the BUN just after the first dialysis of the week.
  • U2 is the BUN just prior to the second dialysis of the week.
  • ID stands for Interdialytic period.
  1. Daugirdas JT, Ing TS. Handbook of Dialysis. Second Edition (1994) pp 92-107.
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