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EĆ12 800 Series Operator's Manual
Precision on aqueous calibration verification materials was estimated using three
840 systems. At least seven runs per instrument were made over five days. Two
replicates of each control level were analyzed in each run.
Table E-10 summarizes the results of the 840 system precision for CVM levels 1
and 4.
*
[
pH 1 50 6.804 0.001 0.002
4 50 7.804 0.001 0.002
pCO
2
1 50 103.9 0.67 1.73
4 50 12.8 0.21 0.52
pO
2
1 50 24.3 0.72 1.81
4 50 249.9 2.06 5.11
* WRSD = within-run standard deviation
[
TotSD = total standard deviation
For testing syringe, capillary, microsyringe, and microcapillary modes, blood was
collected in heparinized vacuum tubes. It was tonometered at 37.0_C to each of
three levels to prepare samples for pH analysis and five levels to prepare samples
for pCO
2
and pO
2
analysis. Multiple runs were made using these samples on three
840 systems. The experimental protocol called for three replicates of each level in
each run.
For testing the expired gas mode, 10 mL of tonometry gas were drawn into a
12 mL syringe and aspirated into the 840 system for analysis. Multiple runs were
made using five levels of expired gas on four 840 instruments. The experimental
protocol called for three replicates of each level in each run.