Abstract
We investigated the analytical performance and imprecision of three commercially available nephelometers for the quantification of various proteins in pooled serum and cerebrospinal fluid. Albumin, transferrin, IgG, IgA, and IgM in serum were determined nephelometrically (BNA, Behring; Array, Beckman) and turbidimetrically (Cobas Bio, Hoffmann-La Roche). All these proteins in cerebrospinal fluid except transferrin were determined nephelometrically with all three systems. CVs and lower limits of detection were compared for all instruments, and stability of calibration curves was evaluated.
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