18 - 8
BeneVision N1 Patient Monitor Operator’s Manual
*: BUN/Cr is a ratio at mol unit system.
urine potassium excretion
URKEx
mmol/24 hrs
URKEx (mmol/24 hrs) = Urine (ml/24 hrs) ×
URK (mmol/L)/1000
sodium potassium ratio
Na/K
%
Na/K (%) = 100 × URNa (mmol/L)/URK (mmol/
L)
clearance of sodium
CNa
ml/24 hrs
CNa (ml/24 hrs) = URNa (mmol/L) × Urine (ml/
24 hrs)/SerNa (mmol/L)
creatinine clearance rate
Clcr
ml/min
Clcr (ml/min) = Ucr (μmol/L) × Urine (ml/24
hrs)/[Cr (μmol/L) × (BSA (m
2
)/1.73) × 1440]
fractional excretion of
sodium
FENa
%
FENa (%) = 100 × URNa (mmol/L) × Cr (μmol/
L)/[SerNa (mmol/L) × Ucr (μmol/L)]
osmolar clearance
Cosm
ml/min
Cosm (ml/min) = Uosm (mOsm/kgH
2
O) ×
Urine (ml/24 hrs)/(Posm (mOsm/kgH
2
O) ×
1440)
free water clearance
CH2O
ml/hr
CH2O (ml/hr) = Urine (ml/24 hrs) × [1 - Uosm
(mOsm/kgH
2
O)/Posm (mOsm/kgH
2
O)]/24
urine to plasma
osmolality ratio
U/P osm
None
U/P osm = Uosm (mOsm/kgH
2
O)/Posm
(mOsm/kgH
2
O)
blood urea nitrogen
creatinine ratio
BUN/Cr*
Mmol/L
BUN/Cr = 1000 × BUN (mmol/L)/Cr (μmol/L)
urine-serum creatinine
ratio
U/Cr
None
U/Cr (mmol/L) = Ucr (μmol/L)/Cr (μmol/L)
Calculated Parameters
Label
Unit
Formula
