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. 2021 Dec 14;8:786261. doi: 10.3389/fnut.2021.786261

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Copyright © 2021 Hosbas Coskun, Wise and Kuszak.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Control chart for the NIST determination of 25(OH)D₃ in SRM 972a for DEQAS exercises from July 2013 to January 2017. Error bars are ± SD for duplicate analyses of SRM 972a. Solid line is the certified value and dashed line is the uncertainty of the certified value. Burdette et al. (35), adapted by permission of AOAC International (aoac.org).