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pISSN 2950-9114 eISSN 2950-9122
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Report On Proficiency Testing

Lab Med Qual Assur 2023; 45(4): 125-134

Published online December 31, 2023


Copyright © Korean Association of External Quality Assessment Service.

Report of the Korean Association of External Quality Assessment Service on Urinalysis and Fecal Occult Blood Testing (2022)

Chang-Ho Jeon and Sang-Gyung Kim

Department of Laboratory Medicine, Daegu Catholic University School of Medicine, Daegu, Korea

Correspondence to:Chang-Ho Jeon
Department of Laboratory Medicine, Daegu Catholic University School of Medicine, 33 Duryugongwon-ro 17-gil, Nam-gu, Daegu 42472, Korea
Tel +82-53-650-4144
E-mail chjeon@cu.ac.kr

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


In 2022, external quality assessment trials were conducted for urinalysis and fecal occult blood (FOB) testing with data from 1,751 and 696 participants, respectively. Urine chemistry tests, including pH, protein, glucose, ketone, bilirubin, blood, urobilinogen, nitrite, and leukocyte, and specific gravity were conducted 3 times. Additionally, urine sediment and FOB tests were performed twice. Results of urine chemistry and specific gravity tests consistently surpassed the acceptable rates of >95%, except for ketone, protein, bilirubin, leukocyte, and urobilinogen. Instruments with <80% acceptable rates in pH, blood, ketone, leukocytes, protein, bilirubin, or urobilinogen tests were Simens (10 times), Arkray (7 times), and Sysmex (6 times). The urine sediment test showed acceptable rates of above 80% for transitional epithelial cells, bilirubin, ammonium magnesium phosphate, uric acid, and calcium phosphate crystals but below 80% for waxy cast and renal tubular epithelial cells. In the FOB qualitative test, all reagents showed acceptable rates of above 90% for negative and positive samples. However, in the FOB quantitative test, positive samples results varied among companies, suggesting the need for standardization. Alfresa NS-Plus C showed high values for the negative specimen.

Keywords: Quality control, Urinalysis, Occult blood, Accuracy

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