RADIOMETER ABL90 FLEX - Measurement and Corrections; Oximetry Parameters; Bilirubin

ABL90 FLEX reference manual 5. Sensors and optical system
5-47
Measurement and corrections
The oximetry parameters are calculated as follows:
Parameter Equation
ctHb(meas)
 cO
2
Hb + cCOHb + cHHb + cMetHb
s
O
2

2
OHb
eHb
c
c
ceHb = cHHb + cO
2
Hb (effective hemoglobin)
F
O
2
Hb

2
OHb
tHb
c
c
F
COHb

COHb
tHb
c
c
F
HHb

HHb
tHb
c
c
F
MetHb

MetHb
tHb
c
c
FHbF
=
HbF
tHb
c
c
where:
cO
2
Hb = concentration of oxyhemoglobin in the sample
cCOHb = concentration of carboxyhemoglobin in the sample
cHHb = concentration of deoxyhemoglobin in the sample
cMetHb = concentration of methemoglobin in the sample
cHbF = concentration of fetal hemoglobin in the sample (is not measured
directly, but determined on the basis of a definition equation)
Bilirubin is calculated as follows:
Hct(calc)1
tBil(B)
tBil(P)


c
c
where:
ctBil(P) = concentration of total bilirubin in plasma
ctBil(B) = concentration of diluted plasma bilirubin after sample
hemolyzation
Hct(calc) = calculated hematocrit (a fraction).
tHb
g/dL
0301.0
Hct(calc) c
For further details on Hct(calc) please refer to
Interference
Tests
and the explanation of MCHC (Mean Corpuscular
Hemoglobin Concentration) in chapter 7 in this manual.
Oximetry
parameters
Bilirubin