Clinical Chemistry -- Snyder et al. 51 (10): 1830 Figure 1

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Figure 1. Bland–Altman plots comparing the two hCG methods (A) and the two FSH methods (B).

Results are shown as the ratio of the Roche Elecsys to the Bayer Centaur method (for hCG) or ratio of the Vitros ECi to the Bayer Centaur method (for FSH) vs the average hormone concentration. The dashed lines indicate the limits of acceptability defined as 2 SD of the mean ratio for hCG [mean (SD), 0.98 (0.30)] and FSH [1.05 (0.38)].