Roche Diagnostics
Operator’s Manual · Version 3.4 C-35
Cedex Bio analyzer 8 Data analysis methods
ISE measurements
Results
Each ISE measurement consists of the measurement of the sample and the
measurement of the corresponding ISE calibrator. The electrode potential results
from the respective sample or calibrator measurement.
Calculation of concentration
The sodium and potassium concentration is determined using the following
equation:
Calculation checks
Test range
e
See Test Range (level concentration) check on page C-27.
Correlation correction
e
See Correlation correction on page C-35.
Laboratory conversion
e
See Laboratory conversion on page C-35.
Reference range
e
See Reference Range check on page C-27.
Ionic concentration of sample or control.
Nominal concentration of ISE Solution 1.
Electrode potential of sample or control in mV.
Electrode potential of ISE calibrator in mV.
ISE Solution 1 factor.
Slope in mV/dec.
C
samp QC
C
sol 1
10
E
samp QC
E
ISE cal indir
–
S
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F⋅⋅=
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