Patterns of Dissimilarities Among Instrument Models in Measuring Po2, Pco2, and pH in Blood Gas Laboratories: Statistical comparison of the six RAD models

20 Apr
2014

Statistically, none of the six IL models measure all three analytes without statistically significant differences. The closest matches are the 1304, 1306, and 1312 models that are not dissimilar for two analytes. The 1400 and 1420 models are not dissimilar for Po2 and Pco2. The 1620 models differs from the other five models for all three analytes. Comparing all IL models for Po2, average differences between models are <1 mm Hg for 11 comparisons and 1 to 3 mm Hg for 4 comparisons. For the full range of Pco2, average differences between models are < 1 mm Hg for 10 comparisons and 1 to 2 mm Hg for 5 comparisons; while at Pco2 values >40 mm Hg, average differences are <1 mm Hg for 6 comparisons, 1 to 3 mm Hg for 7 comparisons, and 3 to 4 mm Hg for 3 comparisons. For pH, average differences between models are <0.001 U for three comparisons, 0.001 to 0.003 U for one comparison, 0.003 to 0.005 U for four comparisons, 0.005 to 0.007 U for five comparisons, and 0.007 to 0.014 U for two comparisons. buy asthma inhalers online

Statistical comparison of the six RAD models shows that the 30 and 3 models are not dissimilar for any analytes. The same is true of the 300 and 330. The latter models are also not dissimilar from the 500 model for Po2 and Pco2. The 500 and 520 models are not dissimilar for Pco2 and pH. The two models are statistically dissimilar for Po2 only above 80 mm Hg, where the average Po2 differences are <1.5 mm Hg. Comparing all RAD models for full range Po2, average differences between models are <1 mm Hg for six comparisons and 1 to 3 mm Hg for nine comparisons; while for Po2 levels >90 mm Hg, differences were <1 mm Hg for four comparisons, 1 to 3 mm Hg for eight comparisons, and 3 to 5 mm Hg for three comparisons. For Pco2, average differences between models are <1 mm Hg for 13 comparisons and 1 to 2 mm Hg for 2 comparisons. For pH, average differences are <0.001 U for four comparisons, 0.001 to 0.003 U for four comparisons, 0.003 to 0.005 U for two comparisons, and 0.005 to 0.007 U for five comparisons.

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