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Agreement between the turbidimetric immunoassay vs radial immunodiffusion (RID) via traditional Bland‐Altman analyses for all tested samples (A) and an extended Bland‐Altman plot for a subset of samples (n = 20) in which the reference test (RID) was repeated (B). The differential bias between these 2 methods was 4.05 (CI: 0.91, 7.20) and proportional bias was 0.38 (CI: 0.29, 0.46). LoA, limits of agreement.
