J Lab Med Qual Assur 2016; 38(3): 120-128
Published online September 30, 2016
Copyright © Korean Association of External Quality Assessment Service.
Chang-Ho Jeon and A-Jin Lee, as the Urinalysis and Routine Microscopy Subcommittee, Korean Association of External Quality Assessment Service
Department of Laboratory Medicine, Daegu Catholic University School of Medicine, Daegu, Korea
Correspondence to:Chang-Ho Jeon
Department of Laboratory Medicine, Daegu Catholic University Medical Center, 33 Duryugongwon-ro 17-gil, Namgu, Daegu 42472, Korea
Tel: +82-53-650-4144 Fax: +82-53-653-8672 E-mail: email@example.com
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 Korea, external quality assessment trials for urinalysis and faecal occult blood (FOB) were performed for 1,250 participants. Urine chemistry and FOB tests were evaluated three times, whereas urine sediment by photography was evaluated twice. Urine chemistry tests consisted those for pH, protein, glucose, ketone, bilirubin, blood, urobilinogen, nitrite, leukocyte, and specific gravity. The results of the urine chemistry and specific gravity tests showed accuracy rates >95%. In the FOB quality test, all reagents showed false-positive results. These reagents showed positive results in stool specimens containing >11 ng/mL haemoglobin. In the FOB quantitative test, the results were significantly different, based on the instrument used for the measurements. The average accuracy rate of urine sediments was 90.8%, whereas those for renal epithelial cells and cholesterol crystals were 83%.
Keywords: Quality assessment, Urinalysis, Occult blood
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