E-28 Rapidlab 1200 Operator’s Guide: System Specifications
02087462 Rev.V
Method Comparison with Human Whole Blood Samples
For testing syringe and capillary modes, blood was collected in heparinized vacuum tubes.
It was tonometered at 37°C or adjusted chemically. Several levels of tHb were prepared by
separating the red cells from the plasma and recombining appropriately. Specimens were
assayed on Rapidlab
1245 and Rapidlab 865 systems.
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 1245 (dependent variable) versus the Rapidlab
865 (independent
variable). Results are summarized in the table below.
Table E-24 Rapidlab 1245 System Human Whole Blood Method Comparison—pH
Mode N Slope Intercept RMSE r
2
Min Max
Capillary 135 1.002 -0.013 0.006 0.999 7.0 7.7
Syringe 288 1.008 -0.059 0.007 0.999 7.0 7.7
Micro-
capillary
144 0.988 0.089 0.015 0.994 7.0 7.7
Micro-
syringe
144 1.003 -0.029 0.007 0.999 7.0 7.6
pH Only
Capillary
144 1.018 -0.123 0.009 0.998 7.0 7.7
pH Only
Syringe
288 1.014 -0.096 0.007 0.999 7.0 7.7
Table E-25 Rapidlab 1245 System Human Whole Blood Method Comparison—
pCO
2
Mode N Slope Intercept RMSE r
2
Min Max
Capillary 215 0.961 1.609 5.348 0.993 6.7 231.4
Syringe 429 0.962 1.618 5.087 0.994 6.7 241.8
Micro-
capillary
108 1.004 1.044 3.225 0.998 6.9 237.3
Micro-
syringe
216 0.991 -1.479 4.363 0.996 6.7 242.0
Table E-26 Rapidlab 1245 System Human Whole Blood Method Comparison—pO
2
Mode N Slope Intercept RMSE r
2
Min Max
Capillary 215 0.974 4.195 12.240 0.996 27.6 677.3
Syringe 429 0.984 2.932 11.912 0.996 25.4 687.4
Micro-
capillary
84 0.922 8.530 5.706 0.993 26.7 254.3
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