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Annual Report on the External Quality Assessment Scheme of Viral Markers and Serological Tests for Syphilis in Korea (2015)
J Lab Med Qual Assur 2016;38:214-224
Published online December 31, 2016
© 2016 Korean Association of Quality Assurance for Clinical Laboratory.

Young Joo Cha1, Jae Hoon Bae1, Young Soon Jung1, and Seok Lae Chae2, as the Immunoserology Subcommittee, Korean Association of External Quality Assessment Service

1Department of Laboratory Medicine, Chung- Ang University College of Medicine, Seoul;
2Department of Laboratory Medicine, Dongguk University Ilsan Hospital, Dongkuk University College of Medicine, Goyang, Korea
Correspondence to: Young Joo Cha
Department of Laboratory Medicine, Chung-Ang University College of Medicine, 84 Heukseokro, Dongjak-gu, Seoul 06974, Korea
Tel: +82-2-6299-2720 Fax: +82-2-6298-8630 E-mail: chayoung@cau.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/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
As the Immunoserology Subcommittee of the Korean Association of External Quality Assessment, we organized two trials on the external quality assessment of viral markers and serological tests for syphilis (STS) in 2015. For this purpose, we delivered three kinds of pooled sera specimens for external proficiency testing to 1,071 and 1,074 institutions for the first and second trials, respectively. Pooled sera were checked for their homogeneity and stability using multiple methods between the day of their manufacture and three days after dispatching. The number of participating laboratories was 1,055 (98.5%) and 1,055 (98.2%) in the first and second trial, respectively. The most commonly tested items were hepatitis B surface antigen, followed by the antibodies to hepatitis B surface antigen, anti-human immunodeficiency virus, anti-hepatitis C virus, STS, and anti-hepatitis B core. The most frequently used methods for detecting viral markers were the chemiluminescence immunoassay (CLIA) and the electrochemiluminescence immunoassay, which were found to generate few false positive results. In contrast, false negative results were frequently found when the immunochromatographic assay (ICA) was used; the use of ICA for detecting viral markers has been steadily increasing in recent years. Furthermore, the use of turbidoimmunoassay and CLIA, tests recently introduced for the measurement of non-treponemal and treponemal antibodies, is also increasing.
Keywords : External quality assessment, Hepatitis B, Hepatitis C, HIV, Immunoassay, Laboratory proficiency testing, Serology, Syphilis
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