Biolight Meditech S10 - Page 208

S10/S12/S10A/S12A Patient Monitor User’s Manual
19-13
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19.7.3. Output Parameter and calculation formula
Output
Parameter
Unit Full Name Formula
URNaEx mmol/24h
urinesodium
excretion
URNaEx= Urine ×
URNa/1000
Cosm mL/min osmolar clearance
Cosm=Uosm×(Urine/24/60)/
Posm
URKEx mmol/24h
urine potassium
excretion
URKEx= Urine ×
URK/1000
CH2O mL/h
free water
clearance
CH20=Urine/24×(1－
Uosm/Posm)
Na/K %
sodium potassium
ratio
Na/K=URNaEx/URKEx
U/Posm
urine to plasma
osmolality ratio
U/Posm =Uosm/Posm
BUN/Cr
blood ureanitrogen
creatinine ratio
BUN/Cr
CNa mL/24h
clearance of
sodium
CNa(mL/24hrs)=URNa)×Ur
ine/SerNa
Clcr mL/min
creatinine clearance
rate
Ccr=(140-age) × weight(kg)
/ [72×Scr(mg/dL)] or
Ccr=[(140- age) ×
weight(kg)] / [0.818×Scr
(umol/L)]
lh lli
U/Cr
urine-serum
creatinine ratio
UCr/Cr
FENa %
fractional excretion
of sodium
FENa%=(URNa×Cr)/(SerNa
×Ucr) ×100%
*：BUN/Cr is a ratio at mol unit system.