Siemens RAPIDLAB 248 Operator's Manual page 114

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