Siemens RAPIDLAB 248, Operator'S Manual, Page: 114 / 135

Precision and Recovery on Whole Blood
Whole blood was tonometered at 37
°
C and run on four 248 pH/Blood Gas
Analyzers.
Analyte n WRSD Expected Observed %Recovery %CV
Level 1
pH 15 0.008 7.502 7.491 99.9 0.10
p CO
2
15 0.435 21.3 21.7 102.0 2.00
p O
2
15 2.819 376.3 368.5 97.9 0.77
Level 2
pH 17 0.006 7.377 7.371 99.9 0.09
p CO
2
17 0.454 35.4 35.6 100.5 1.28
p O
2
17 1.139 85.1 84.4 99.2 1.35
Level 3
pH 20 0.008 7.300 7.299 100.0 0.11
p CO
2
20 0.522 49.6 49.0 98.7 1.07
p O
2
20 0.301 49.8 49.8 100.0 0.60
Level 4
pH 19 0.010 7.073 7.064 99.9 0.14
p CO
2
19 2.081 99.1 98.9 99.8 2.10
p O
2
19 2.309 148.6 147.4 99.2 1.57
Level 5
pH 19 0.007 6.972 6.972 100.0 0.10
p CO
2
19 0.737 148.6 148.5 99.9 0.50
p O
2
19 1.252 106.2 104.8 98.7 1.19
WRSD = within-run standard deviation
Precision on Controls
Data was collected from nine runs across four 248 pH/Blood Gas Analyzers
over nine days.
pH
Level n Mean WRSD TotSD %CV
1 108 7.141 0.002 0.006 0.08
2 108 7.403 0.002 0.009 0.12
3 108 7.610 0.002 0.012 0.15
Page E-2 248 Operator’s Manual