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Recent Trends in Creatinine Assays in Korea: Long-Term Accuracy-Based Proficiency Testing Survey Data by the Korean Association of External Quality Assessment Service (2011-2019)

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Abstract
Background: Accurate serum creatinine (Cr) concentration measurement is essential for evaluating kidney function. In 2011, the Korean Association of External Quality Assessment Service (KEQAS) launched an accuracy-based Cr proficiency testing (ABCr PT) survey. We analyzed long-term data of the KEQAS ABCr PT survey collected between 2011 and 2019 to assess recent trends in Cr assays in Korea.

Methods: The ABCr PT survey including three commutable fresh-frozen serum samples was performed twice a year. The target Cr concentration was assigned using isotope-dilution mass spectrometry. We analyzed data obtained from the participating laboratories, calculated the yearly bias, and evaluated bias trends for the major reagents and instruments. Outliers were excluded from all analysis.

Results: The mean percentage bias based on the total data of all participating laboratories was 10.8% in the 2011-A survey and 0.2% in 2019-B survey. Bias for the major reagents and instruments differed depending on the manufacturer. Enzymatic assays generally showed desirable bias ranging from -3.9% to 3.2% at all Cr concentrations and lower interlaboratory variability than non-enzymatic assays (enzymatic vs. non-enzymatic, 3.3%-7.2% vs. 6.3%-9.1%).

Conclusions: Although the mean percentage bias of Cr assays tends to decrease over time, it is necessary to continuously strive to improve Cr assay accuracy, especially at low concentrations.
Author(s)
민원기송정한윤여민이경훈이우창전사일정태동조은정
Issued Date
2021
Type
Article
Keyword
AccuracyBiasCreatinineProficiency testingSurvey
DOI
10.3343/alm.2021.41.4.372
URI
https://oak.ulsan.ac.kr/handle/2021.oak/8571
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_nrf_kci_oai_kci_go_kr_ARTI_9798941&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Recent%20Trends%20in%20Creatinine%20Assays%20in%20Korea:%20Long-Term%20Accuracy-Based%20Proficiency%20Testing%20Survey%20Data%20by%20the%20Korean%20Association%20of%20External%20Quality%20Assessment%20Service&offset=0&pcAvailability=true
Publisher
ANNALS OF LABORATORY MEDICINE
Location
대한민국
Language
영어
ISSN
2234-3806
Citation Volume
41
Citation Number
4
Citation Start Page
372
Citation End Page
379
Appears in Collections:
Medicine > Medicine
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