B-276 Assessment of Harmonization among Siemens Point-of-care and Central Laboratory Blood Gas Systems Bethoney C, Fennell S, LaRock K, Poirier D. Siemens Healthcare Diagnostics Inc., Norwood, MA, U.S. pH Objective 7.8 7.6 Identity vs. RAPIDLab 1265 7.4 vs. RAPIDLab 348EX* vs. RAPIDPoint 405 7.2 • RAPIDPoint 405 Blood Gas System vs. RAPIDPoint 500 Blood Gas System Validation Deming regression statistics for each comparison across intervals for each measurand are shown in Tables 1 through 3. The mean of the replicates for each measurand and the identity line are depicted in Figures 1 through 11. The arrows on each figure indicate clinically relevant medical decision levels (MDLs) for the following measurands that are available on Siemens blood gas systems: vs. RAPIDLab 1265 vs. RAPIDLab 348EX* 80 vs. RAPIDPoint 405 Identity vs. RAPIDLab 1265 400 vs. RAPIDLab 348EX* vs. RAPIDPoint 405 300 200 100 0 0 6.8 6.8 7.0 7.2 7.4 7.6 7.8 0 8.0 40 80 120 160 0 180 Figure 1. pH method comparison of comparative systems vs. the RAPIDPoint 500 system. Potassium (K+) Identity 160 vs. RAPIDLab 1265 vs. RAPIDLab 348EX* vs. RAPIDPoint 405 140 120 10 Identity 8 vs. RAPIDLab 1265 vs. RAPIDLab 348EX* 6 vs. RAPIDPoint 405 4 0 • pH, pCO2, pO2 140 160 180 0 200 2 • Total hemoglobin, neonatal bilirubin Table 1. Method comparison statistics for RAPIDLab 1265 vs. RAPIDPoint 500 systems. 4 6 8 10 3 vs. RAPIDLab 1265 vs. RAPIDLab 348EX* vs. RAPIDPoint 405 2 1 0 12 0 1 Intercept r 2 Interval 1.01 -0.034 0.9988 6.820 to 7.781 pCO2 (mmHg) 103 0.8 3.1 1.12 -2.7 0.9887 6.9 to 190.4 pO2 (mmHg) 114 4.1 9.2 1.04 2.2 0.9965 27.6 to 653.3 Na+ (mmol/L) 124 0.1 0.7 1.03 -3.9 0.9976 100.4 to 198.3 K+ (mmol/L) 105 -0.07 0.22 1.10 -0.35 0.9982 0.62 to 10.00 Ca2+ (mmol/L) 133 -0.01 0.00 1.06 -0.07 0.9977 0.31 to 4.86 Cl- (mmol/L) 124 2 3 1.08 -5 0.9944 66 to 140 Glucose (mg/dL) 100 5 4 0.99 6 0.9981 26 to 683 Lactate (mmol/L) 100 0.17 0.13 0.98 0.20 0.9870 0.31 to 27.13 tHb (g/dL) 112 -0.1 0.0 1.01 -0.1 0.9997 2.5 to 23.8 nBili (mg/dL) 110 0.9 1.1 1.03 0.7 0.9732 2.3 to 27.4 Table 2. Method comparison statistics for RAPIDLab 348EX* vs. RAPIDPoint 500 systems. Bias at MDL 1 Bias at MDL 2 pH (units) 113 0.009 0.007 Deming Intercept Slope 0.99 0.103 r2 Interval 0.9981 6.820 to 7.781 pCO2 (mmHg) 109 2.1 2.3 1.01 1.8 0.9833 6.6 to 198.6 pO2 (mmHg) 113 2.5 10.2 1.05 -0.5 0.9950 27.6 to 653.3 Na+ (mmol/L) 124 3.1 2.3 0.96 8.3 0.9959 100.4 to 198.3 K+ (mmol/L) 101 0.06 0.22 1.05 -0.09 0.9973 0.62 to 9.06 Ca2+ (mmol/L) 121 0.06 0.11 1.25 -0.21 0.9974 0.31 to 4.18 Cl- (mmol/L) 124 0 1 1.06 -6 0.9942 66 to 140 Table 3. Method comparison statistics for RAPIDPoint 405 vs. RAPIDPoint 500 systems. 130 Identity 120 vs. RAPIDLab 1265 110 vs. RAPIDLab 348EX* 100 vs. RAPIDPoint 405 90 80 n Bias at MDL 1 Bias at MDL 2 Deming Intercept Slope r2 Interval pH (units) 116 -0.003 -0.002 1.00 -0.038 pCO2 (mmHg) 110 0.4 1.8 1.07 -1.6 0.9785 6.6 to 190.4 pO2 (mmHg) 116 0.8 5.4 1.03 -0.9 0.9970 27.6 to 653.3 Na+ (mmol/L) 124 0.6 0.8 1.01 -0.2 0.9979 100.4 to 198.3 K+ (mmol/L) 104 0.00 0.02 1.01 -0.03 0.9992 1.31 to 10.00 Ca2+ (mmol/L) 133 0.00 -0.01 0.96 0.04 0.9973 0.31 to 4.86 Cl- (mmol/L) 119 0 2 1.09 -8 0.9974 66 to 137 Glucose (mg/dL) 100 3 0 0.98 4 0.9972 26 to 683 tHb (g/dL) 112 -0.1 0.0 1.01 -0.2 0.9996 2.5 to 23.8 nBili (mg/dL) 110 0.1 0.1 1.01 0.0 0.9944 2.3 to 27.4 0.9987 6.820 to 7.781 580 500 Identity 420 vs. RAPIDLab 1265 vs. RAPIDPoint 405 340 260 180 25 20 Identity 15 vs. RAPIDLab 1265 10 5 70 100 60 20 60 70 80 90 100 110 120 130 140 150 0 20 100 RAPIDPoint 500 System Mean Results (mmol/L) 180 260 340 420 500 580 0 660 Figure 7. Cl- method comparison of comparative systems vs. the RAPIDPoint 500 system. Figure 8. Glucose method comparison of comparative systems vs. the RAPIDPoint 500 system. Total Hemoglobin (tHb) 30 20 Identity vs. RAPIDLab 1265 15 vs. RAPIDPoint 405 10 5 10 15 20 25 30 Figure 9. Lactate method comparison of comparative systems vs. the RAPIDPoint 500 system. Conclusion Neonatal Bilirubin (nBili) 25 5 RAPIDPoint 500 System Mean Results (mmol/L) RAPIDPoint 500 System Mean Results (mg/dL) 25 Identity Harmonization at clinically relevant medical decision levels was demonstrated among Siemens POC and central lab blood gas systems for the measurands evaluated. The slopes for each measurand were between 0.96 and 1.25, with r2 ≥ 0.9785. 20 vs. RAPIDLab 1265 vs. RAPIDPoint 405 15 References 1. Malone B. AACC’s Thought Leadership Series: Why Harmonization Matters. 10 5 0 0 Measurand 30 Comparative Systems (mmol/L) 0.018 Comparative Systems (mg/dL) 0.017 Comparative Systems (mg/dL) 114 n 5 140 pH (units) Measurand 4 Lactate 660 Comparative Systems (g/dL) n Deming Slope 3 Figure 6. Ca2+ method comparison of comparative systems vs. the RAPIDPoint 500 system. Glucose Chloride (Cl-) Comparative Systems (mmol/L) Measurand Bias at MDL 2 2 RAPIDPoint 500 System Mean Results (mmol/L) Figure 5. K+ method comparison of comparative systems vs. the RAPIDPoint 500 system. 150 Bias at MDL 1 700 Identity • Sodium, potassium, ionized calcium, chloride Figure 4. Na+ method comparison of comparative systems vs. the RAPIDPoint 500 system. 600 4 RAPIDPoint 500 System Mean Results (mmol/L) RAPIDPoint 500 System Mean Results (mmol/L) • Glucose, lactate 500 5 2 100 400 Calcium (Ca2+) 12 180 300 Figure 3. pO2 method comparison of comparative systems vs. the RAPIDPoint 500 system. 200 120 200 RAPIDPoint 500 System Mean Results (mmHg) Figure 2. pCO2 method comparison of comparative systems vs. the RAPIDPoint 500 system. Sodium (Na+) 100 100 RAPIDPoint 500 System Mean Results (mmHg) RAPIDPoint 500 System Mean Results (Units) Comparative Systems (mmol/L) • RAPIDLab 348EX* Blood Gas System vs. RAPIDPoint 500 Blood Gas System 120 500 7.0 Comparative Systems (mmol/L) • RAPIDLab 1265 Blood Gas System vs. RAPIDPoint 500 Blood Gas System Identity 600 40 Methodology Method comparison studies were performed with whole blood among POC (RAPIDPoint®) and central lab (RAPIDLab®) blood gas systems in accordance with the CLSI EP-09 guideline. A minimum of 100 whole blood replicates were assayed on all systems listed below. Samples were altered as needed to span the reportable ranges for each measurand. Correlation statistics including Deming slopes, intercepts, and coefficients of determination (r2) were generated for the following comparisons: 160 Comparative Systems (mmHg) 700 Comparative Systems (mmHg) AACC’s International Consortium for Harmonization of Clinical Laboratory Results has been working with a variety of stakeholders regarding harmonization among results from different methods and labs for the same measurand.1 Malone states, “Harmonization means achieving comparable results among different measurement procedures.” Further, “When lab measurement procedures give different results for the same specimen, patients may get the wrong treatment, because decision criteria are not appropriate for the procedure in use. In order to do this effectively, results need to be harmonized.” Partial Pressure Oxygen (pO2) 200 Comparative Systems (mmol/L) Relevance 8.0 Comparative Systems (Units) Determine correlations between Siemens point-of-care (POC) and central lab blood gas systems in order to demonstrate harmonization across the product portfolio. Partial Pressure Carbon Dioxide (pCO2) 0 5 10 15 20 25 RAPIDPoint 500 System Mean Results (g/dL) Figure 10. tHb method comparison of comparative systems vs. the RAPIDPoint 500 system. 0 5 10 15 20 25 30 RAPIDPoint 500 System Mean Results (mg/dL) Figure 11. Neonatal bilirubin method comparison of comparative systems vs. the RAPIDPoint 500 system. *Not available for sale in the U.S. Product availability varies by country. RAPIDPoint, RAPIDLab, and all associated products are trademarks of Siemens Healthcare Diagnostics Inc. All other trademarks and brands are the property of their respective owners. 07-2014 | All rights reserved | ©2014 Siemens Healthcare Diagnostics Inc. A91DX-POC-140068-GC1-4A00
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