Fig. 2
From: Validation of an equine serum amyloid A assay with an unusually broad working range
Comparison of serum amyloid A (SAA) concentrations measured in a novel immunotubidometric assay developed for determination of SAA concentrations in horses (VET-SAA) and in an immunotubidometric assay previously validated for use in horses (LZ SAA). Panel (a) shows method comparison in the full concentration range, panel (b) shows method comparison in the most frequently encountered/relevant concentration range (0–3000 mg/L), solid line in (b) = Deming regression line, dashed lines = perfect agreement (X = Y). Concentrations assessed in the LZ SAA assay trailed off at around 3000 mg/L causing poor correlation between the two assays at higher concentrations (a), but in the 0 to approximately 3000 mg/L concentration range, a high degree of correlation was observed between the two assays (b)