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Fig. 4.

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Fig. 4. Difference in MU values between two differently calculated groups. (A) As the mean differences (%) increased, urel_tot values calculated regardless of mean change showed a constant MU, whereas usel_sub values calculated separately by mean and then combined showed gradual increases in MU. (B) MU differences (=%urel_tot – %urel_sub) with respect to mean differences (%) are plotted. For example, a mean difference of 10% after one reagent lot change corresponded to a difference in MU of 3.41%.
Abbreviations: MU, measurement uncertainty; urel_tot, relative uncertainty calculated regardless of a reagent lot change; urel_sub, relative combined uncertainty calculated from values obtained from each subgroup; %urel, relative uncertainty, akin to CV.
Ann Lab Med 2022;42:630~637

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