E-18 Rapidlab 1200 Operator’s Guide: System Specifications
02087462 Rev.V
Method comparison was quantified by obtaining estimates of proportional (slope), and
constant (intercept) bias, root mean square error (RMSE), and method correlation (R
square for r
2
coefficient of determination) by performing an ordinary least squares
analysis of the Rapidlab 1240 (dependent variable) versus the Rapidlab 865 (independent
variable). Results are summarized in the table below.
Rapidlab 1245 System Performance Characteristics
All performance data presented in this section was generated using the Rapidlab 1245
system. The system performed calibrations using the default settings recommended by
Siemens for optimum performance. All reported values were corrected to 760
mmHg. All
data was collected at room temperature (about 23°C). You should determine your own
performance characteristics in your laboratory with your Rapidlab 1245 system.
Precision on Controls
Quality control materials, including manual (QC) and automatic (AutomaticQC) were
analyzed on the Rapidlab 1245 system. Manual QC is performed by the operator while
AutomaticQC is performed automatically by the system based on the QC frequency
defined in the system software. The results are presented here.
Table E-14 Rapidlab 1240 Human Whole Blood Method Comparison—pH
Mode n Slope Intercept RMSE r
2
Min Max
Capillary 140 0.989 0.078 0.007 0.999 7.031 7.680
Syringe 286 1.007 -0.050 0.008 0.999 7.020 7.676
Micro-
capillary
144 0.984 0.133 0.013 0.995 7.038 7.671
Micro-
syringe
144 1.021 -0.155 0.007 0.999 7.013 7.651
pH Only
Capillary
135 1.010 -0.064 0.010 0.998 7.015 7.678
pH Only
Syringe
271 1.011 -0.087 0.007 0.999 6.987 7.676
Table E-15 Rapidlab 1240 Human Whole Blood Method Comparison—pCO
2
Mode n Slope Intercept RMSE r
2
Min Max
Capillary 216 0.942 2.097 7.661 0.985 5.7 257.3
Syringe 425 0.971 1.436 7.058 0.988 5.8 256.7
Micro-
capillary
108 1.038 -2.566 5.829 0.993 6.1 256.5
Micro-
syringe
216 1.075 -3.538 6.520 0.992 6.0 266.9
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