Lab Med Qual Assur 2020; 42(4): 157-165
Published online December 31, 2020
Copyright © Korean Association of External Quality Assessment Service.
Chang-Ho Jeon, Sang-Gyung Kim, and Young-Cheol Bae
Department of Laboratory Medicine, School of Medicine, Daegu Catholic University, Daegu, Korea
Correspondence to:Chang-Ho Jeon
Department of Laboratory Medicine, School of Medicine, Daegu Catholic University, 33 Duryugongwon-ro 17-gil, Nam-gu, Daegu 42472, Korea
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
In 2019, external quality assessment trials for urinalysis and fecal occult blood (FOB) testing were conducted using data from 1,650 participants. Urine chemistry tests were performed thrice, while urine sediment and FOB tests were performed twice. Urine chemistry tests consisted of pH, protein, glucose, ketone bodies, bilirubin, blood, urobilinogen, nitrite, leukocyte, and specific gravity analyses. The results of urine chemistry and specific gravity tests showed accuracy rates >95%, except for the pH test; however, in the few instruments, the accuracy rates of pH, along with glucose, ketone, bilirubin, blood, urobilinogen, and leukocytes were <50%, suggesting matrix effects of quality control materials. The accuracy rates of urine sediment analyses were low, especially for contrast media, white blood cast, and broad casts. In contrast, the ability to differentiate between transitional and renal tubular epithelial was high. In the FOB quality test, reagents showed accuracy rates >90%, except for SD (Standard Diagnostics, Korea) and Humasis FOB reagents (Humasis Co., Korea). The accuracy rates of SD FOB reagents improved in the negative specimens. In the FOB quantitative test, the Alfresa NS-Plus C instrument (Alfresa Pharma Co., Japan) showed high values in negative specimens; fortunately, its usage has declined.
Keywords: Quality control, Urinalysis, Occult blood, Accuracy
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