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Fig. 1. Change in coefficient of variation % during the period of cardiac marker external quality assessment program from 2016-1st to 2020-2nd for (A, B) troponin I (TnI) in pooled serum and commercial control material, respectively. (C, D) Troponin T (TnT), (E, F) brain natriuretic peptide (BNP), and (G, H) N-terminal pro-brain natriuretic peptide (NT-proBNP) of each manufacturer. BNP test for the pooled serum sample has been discontinued since 2018 because ethylenediaminetetraacetic acid-plasma is the only suitable specimen recommended by the manufacturers. The instruments used were from the following companies: Siemens (Tarrytown, NY, USA), Abbott (Abbott Park, IL, USA), Beckman Coulter (Brea, CA, USA), LSI Medience Corp. (Tokyo, Japan), Biomerieux (Marcy l’Etoile, France), Radiometer (Brønshøj, Denmark), Roche (Mannheim, Germany), and Alere Inc. (Waltham, MA, USA) (Continued on next page).
Lab Med Qual Assur 2021;43:176~184
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