RADIOMETER ABL800 FLEX, Reference Manual

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ABL800 FLEX Reference Manual 4. User-defined corrections
Electrolyte and metabolite parameters
Preparatory
actions Prior to entering corrections for the electrolyte and metabolite parameters, the user
must obtain the reference values for the chosen parameters using the method
accepted in his/her laboratory.
It should be noted that in order to define corrections:
•
Measurements should be taken on the analyzer without user-defined corrections,
and on the reference analyzer.
•
A series of measurements that cover the entire measuring range should be
performed.
•
The measurements should be made simultaneously on the ABL800 FLEX and
reference analyzers, and samples must be handled correctly.
•
The slope and the offset must be calculated. The user may, for example, make a
linear correlation between the values measured on the ABL800 FLEX and the
reference analyzers, using the ABL800 FLEX as an independent variable.
•
If the measurements are carried out on samples with values within the normal
reference range, then the user may change the offset and leave the slope
unchanged.
•
The user must verify the corrections that are entered.
Details of these procedures may be found in the section Definitions and Test
Conditions in Chapter 5 .
Correcting the
slope The following corrections to the slope are possible within the stated limits:
Parameter Slope (mmol/L)
c K
+
0.750 - 1.250
c Na
+
0.850 - 1.150
c Ca
2+
0.800 - 1.200
c Cl
−
0.850 - 1.150
c Glu 0.750 - 1.250
c Lac 0.750 - 1.250
Correcting the
offset The following corrections to the offset are possible within the stated limits:
Parameter: c K
+
c Na
+
c Ca
2+
c Cl
−
c Glu c Lac
Offset
(mmol/L): ± 0.3 ± 5 ± 0.05 ± 5 ± 0.5 ± 0.5
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