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Comparison of Urinary Total Proteins by Four Different Methods

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Abstract

The total proteins in human urine have been compared by sulfosalicylic acid, sulfosalicylic acid with sodium sulphate and trichloroacetic acid methods with pyrogallol red molybdate method as there are no studies found quantifying imprecision and bias components. Fresh urine of 36 patients was analyzed by four methods. Imprecision and inaccuracy were determined by repeated analysis and method comparison studies using correlation plots, Bland and Altman, and Passing and Bablok regression analyses respectively. The coefficient of variation was 5.07 % for pyrogallol red molybdate; 6.84 % for sulfosalicylic acid; 3.97 % for sulfosalicylic acid with sodium sulphate and 5.93 % for trichloroacetic acid methods. Bland and Altman analysis showed a bias of 5.8, 1.7 and −5.4 for pyrogallol red molybdate versus sulfosalicylic acid, sulfosalicylic acid with sodium sulphate and trichloroacetic acid methods respectively. Passing and Bablok regression revealed a constant bias for pyrogallol red molybdate versus all turbidimetric methods but a proportional bias only with trichloroacetic acid method. Sulfosalicylic acid with sodium sulphate method is preferred to sulfosalicylic acid and trichloroacetic acid methods.

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Acknowledgments

We thank the U.S. National Institutes of Health Fogarty-supported (D43 TW009078) SHARE INDIA and University of Pittsburgh team for conducting the research method courses which contributed to the conduct and publication of this research work. We also thank Dr. Sashidar B, professor/HOD and Dr. Tanuja K, Department of Biochemistry, Osmania University, Hyderabad for their valuable suggestions during the study period. Also, we would thank the senior technician Mr. Venkatesh K who had helped us in the sample analysis.

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Correspondence to Padma Yalamati.

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All procedures performed in this study were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Yalamati, P., Karra, M.L. & Bhongir, A.V. Comparison of Urinary Total Proteins by Four Different Methods. Ind J Clin Biochem 31, 463–467 (2016). https://doi.org/10.1007/s12291-016-0551-3

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  • DOI: https://doi.org/10.1007/s12291-016-0551-3

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