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Relation between NIST-Ghent–assigned VDSP values (VDSPRMP) and values measured by immunoassay via the current immunoassay method for cycles 1 (A) and 2 (B). The solid line represents the weighted Deming regression fit to the data (n = 50 samples). The dashed lines represent the 95% CI. NIST, National Institute of Standards and Technology; RMP, reference measurement procedure; VDSP, Vitamin D Standardization Program.
