Abstract
Urine albumin concentration and albumin–creatinine ratio are important for the screening of early-stage kidney damage. Commutable urine certified reference materials (CRMs) for albumin and creatinine are necessary for standardization of urine albumin and accurate measurement of albumin–urine ratio. Two urine CRMs for albumin and creatinine with certified values determined using higher-order reference measurement procedures were evaluated for their commutability on five brands/models of clinical analyzers where different reagent kits were used, including Roche Cobas c702, Roche Cobas c311, Siemens Atellica CH, Beckman Coulter AU5800, and Abbott Architect c16000. The commutability study was conducted by measuring at least 26 authentic patient urine samples and the human urine CRMs using both reference measurement procedures and the routine methods. Both the linear regression model suggested by the Clinical and Laboratory Standard Institute (CLSI) guidelines and log-transformed model recommended by the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) Commutability Working Group were used to evaluate the commutability of the human urine CRMs. The commutability of the human urine CRMs was found to be generally satisfactory on all five clinical analyzers for both albumin and creatinine, suggesting that they are suitable to be used routinely by clinical laboratories as quality control or for method validation of urine albumin and creatinine measurements.
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Acknowledgements
The authors are grateful to the Health Sciences Authority, Singapore, for the support of this project. The authors would like to thank Ms. Yiting Chen from the Health Sciences Authority, Ms. Sim Zhong Wei from the National University of Singapore, and Ms. Norashikin Binte Rashid and Ms. Lee Miao Qiao Jaelyn from Parkway Laboratories for their contributions to this work. The authors would also like to thank Ms. Cheow Pui Sze for her valuable suggestion on statistics.
The use of anonymized leftover patient urine samples in this study complied with the Declaration of Helsinki.
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Liu, H., Ng, C.Y., Liu, Q. et al. Commutability assessment of human urine certified reference materials for albumin and creatinine on multiple clinical analyzers using different statistical models. Anal Bioanal Chem 415, 787–800 (2023). https://doi.org/10.1007/s00216-022-04472-y
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DOI: https://doi.org/10.1007/s00216-022-04472-y