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International Journal of Medical Laboratory
Shahid Sadoughi University of Medical Sciences
Thu, Oct 30, 2025
[Archive]
Faculty of Medicine and Pharmacy of Oujda, Mohammed First University, Morocco & Central Laboratory, Mohammed VI University Hospital of Oujda, Morocco
Abstract: (30 Views)
Introduction: Creatinine is a key parameter for evaluating renal function. This study aims to assess the repeatability, reproducibility, measurement uncertainty, and method comparison for creatinine measurement by the Jaffé kinetic method on the Architect ci-2800, relying on three levels of controls (low, medium, high).
Materials and Methods: Thirty fresh serum 7.17–74, 6 mg/L range measurements per level were carried out to determine repeatability, and a monitoring period of several days made it possible to evaluate reproducibility. Measurement uncertainty was estimated following the internal quality control + external evaluation of quality. The method comparison in order to estimate bias and the correlation coefficient was assessed by Bland–Altman analysis.. The results were interpreted according to limits set by the reference values (SFBC and RICOS), as well as the manufacturer.
Results: Repeatability coefficient of variations (CVs) were 1.13 % (low), 1.05 % (medium), and 0.50 % (high), all below RICOS targets. Intermediate CVs over 30 days were 2.91 %, 2.02 % and 1.75 %. Expanded uncertainty (k = 2) ranged from 6.4 % to 7.2 % (RICOS ≤ 8.2 %). Regression gave y = 1.005 x – 0.365, r = 0.999, with a mean bias of 2.15 %.
Conclusion: Creatinine measurement by the Jaffé kinetic method on the Architect ci-2800 shows excellent performance in terms of precision (repeatability, reproducibility, measurement uncertainty) and inter-instrument correlation. Quality criteria are generally satisfied, ensuring reliable use for routine clinical monitoring of renal function.
Materials and Methods: Thirty fresh serum 7.17–74, 6 mg/L range measurements per level were carried out to determine repeatability, and a monitoring period of several days made it possible to evaluate reproducibility. Measurement uncertainty was estimated following the internal quality control + external evaluation of quality. The method comparison in order to estimate bias and the correlation coefficient was assessed by Bland–Altman analysis.. The results were interpreted according to limits set by the reference values (SFBC and RICOS), as well as the manufacturer.
Results: Repeatability coefficient of variations (CVs) were 1.13 % (low), 1.05 % (medium), and 0.50 % (high), all below RICOS targets. Intermediate CVs over 30 days were 2.91 %, 2.02 % and 1.75 %. Expanded uncertainty (k = 2) ranged from 6.4 % to 7.2 % (RICOS ≤ 8.2 %). Regression gave y = 1.005 x – 0.365, r = 0.999, with a mean bias of 2.15 %.
Conclusion: Creatinine measurement by the Jaffé kinetic method on the Architect ci-2800 shows excellent performance in terms of precision (repeatability, reproducibility, measurement uncertainty) and inter-instrument correlation. Quality criteria are generally satisfied, ensuring reliable use for routine clinical monitoring of renal function.
Keywords: Architect ci 2800, Creatinine, ISO 15189, Jaffé kinetic method, Repeatability, Reproducibility
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