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Comparison of Analytical Performance of i-Smart 300 and pHOx Ultra for the Accurate Determination of Pleural Fluid pH

 Jooyoung Cho  ;  Young Sam Kim  ;  Young Hwan Kim  ;  Jae-Yeon Lee  ;  In Cheol Bae  ;  Sang-Guk Lee  ;  Jeong-Ho Kim 
 Practical Laboratory Medicine, Vol.14 : e00117, 2019-01 
Journal Title
 Practical Laboratory Medicine 
Issue Date
Blood gas analyzer ; Complicated parapneumonic effusion ; Pleural effusion ; Pleural fluid pH
Background: Pleural fluid pH is an essential test for diagnosing complicated parapneumonic effusion. We evaluated the performance of two blood gas analyzers in measuring pleural fluid pH. Methods: The i-STAT G3+ (Abbott) was used as a reference analyzer to evaluate the pH values obtained from other methods: the i-Smart 300 (i-SENS), the pHOx Ultra (Nova Biomedical), using a clot catcher to filter off microclot, and pH indicator paper. Within-device precision was performed using quality control materials. We compared pleural fluid pH (n = 86) by the above methods and analyzed the concordance rate at the level of the medical decision point, pH 7.2. Results: The within-device coefficient of variations of pH were below 0.1% for all blood gas analyzers tested. The slopes of the regression equations for the i-Smart 300, pHOx Ultra, and pH indicator paper against the reference analyzer were 0.850 (95% confidence interval, CI, 0.800-0.896), 0.714 (95% CI, 0.671-0.766), and 1.105 (95% CI, 0.781-1.581), respectively. The kappa values for the i-Smart 300, pHOx Ultra, and pH indicator paper against the reference analyzer were 0.883 (95% CI, 0.656-1.110), 0.739 (95% CI, 0.393-1.084), and 0.464 (95% CI, 0.102-0.826), respectively. Conclusions: The i-Smart 300 and pHOx Ultra demonstrated good analytical performance and diagnostic accuracy when determining pleural fluid pH compared with that by the i-STAT G3+, whereas the pH indicator paper showed unsatisfactory results.
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1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Laboratory Medicine (진단검사의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Young Sam(김영삼) ORCID logo https://orcid.org/0000-0001-9656-8482
Kim, Jeong Ho(김정호) ORCID logo https://orcid.org/0000-0003-2479-0548
Lee, Sang-Guk(이상국) ORCID logo https://orcid.org/0000-0003-3862-3660
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