18-8
18.6.3
Calculated Parameters and Formulas
Abbreviation
Unit
Full spelling
Formula
URNaEx
mmol/24h
urine sodium
excretion
Urine × URNa / 1000
URKEx
mmol/24h
urine potassium
excretion
Urine × URK / 1000
Na/K
%
sodium potassium
ratio
100 × URNa / URK
CNa
ml/24h
clearance of sodium
URNa × Urine / SerNa
Clcr
ml/min
creatinine clearance
rate
Ucr × Urine / Cr / (BSA / 1.73) / 1440
FENa
%
fractional excretion of
sodium
100 ×
(
URNa × Cr ) / (SerNa × Ucr)
Cosm
ml/min
osmolar clearance
Uosm × Urine / Posm / 1440
CH
2
O
ml/h
free water clearance
Urine × (1
-
Uosm / Posm) / 24
U/P osm
None
urine to plasma
osmolality ratio
Uosm / Posm
BUN/Cr
None*
blood urea nitrogen
creatinine ratio
1000 × BUN / Cr
U/Cr
None
urine-serum creatinine
ratio
Ucr / Cr
*: BUN/Cr is a ratio under the unit of mol.
18.7
Understanding the Review Window
With the review feature, you can review oxygenation, ventilation, hemodynamic and renal calculations. The review
window for each calculation is similar. Take the hemodynamic calculations review window for example, you can access
it by selecting [
Review
] in the [
Hemodynamic Calculation
] window.
In this review window:
You can select
,
or
to view more values.
The values that exceed the range are displayed in yellow background. The [
Unit
] field displays parameter units. If
some parameter values are outside of their normal ranges, you can view their normal range in the [
Unit
] field by
selecting [
Range
].
You can review an individual calculation by selecting its corresponding column and then selecting [
Original
Calc
]. You can record the currently displayed calculations or perform another calculation is this window.
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