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Comparison of six CEA immunoassays by Bland-Altman plots in 40 serum samples. MEDIAN indicates all-assays median. The blue solid line indicates the percent difference from the average of the two assays. The red dashed lines indicate the upper and lower 95 % confidence limits of the percent difference between the two assays. The green solid lines are the accepted bias limits of 7.13 % optimal analytical quality specifications.
