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Annual Report of the Korean Association of External Quality Assessment Service on Urinalysis and Fecal Occult Blood Testing (2018)
J Lab Med Qual Assur 2019;41:75-81
Published online June 30, 2019
© 2019 Korean Association of External Quality Assessment Service.

Chang-Ho Jeon, A-Jin Lee, Sang-Gyung Kim, Hun-Seok Suh, and Young-Cheol Bae

Department of Laboratory Medicine, School of Medicine, Catholic University of Daegu, Daegu, Korea
Correspondence to: Chang-Ho Jeon, Department of Laboratory Medicine, Daegu Catholic University Medical Center, School of Medicine, Catholic University of Daegu, 33 Duryugongwon-ro 17-gil, Namgu, Daegu 42472, Korea, Tel: +82-53-650-4144 Fax: +82-53-653-8672 E-mail:
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
In 2018, external quality assessment trials for urinalysis and fecal occult blood (FOB) were performed using 1,590 participants. Urine chemistry tests were performed thrice while urine sediment and FOB tests twice. Urine chemistry tests comprised of pH, protein, glucose, ketone body, 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. The accuracy rate of urine sediments was low, especially for atypical calcium oxalate crystal and red blood cell cast. In the FOB quality test, reagents showed accuracy rates >90%, except for SD and GC Genedia FOB reagents. In the FOB quantitative test, Alfresa NS-Plus C instrument showed falsely high values in the FOB negative specimens.
Keywords : Quality control, Urinalysis, Occult blood, Accuracy