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. 2016 May 25;11(5):e0156266. doi: 10.1371/journal.pone.0156266

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© 2016 Coetzee et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 3 — NHLS external quality assessment (EQA) scheme samples (n = 20) was analysed on the FACSPresto^™ and SDI values (dark solid line) calculated for (a) absolute CD4 counts and (b) CD4% of lymphocytes. C and D indicate the corresponding performance of PLG/CD4 on the MPL system used as the predicate method in this study. The radar graphs depict the optimal target of zero (dashed line) and the acceptable range of -2 to 2 SDI (red circles with grey shaded area).