IgG avidity by the Architect and Radim CMV IgG Avidity assays. Histograms show data from ROC analysis. Light shaded bars, specimens tested for specificity; dark shaded bars, specimens tested for seroconversion sensitivity. % Avi, percent avidity. Numbers of specimens, given below the histograms, include all specimens from specificity and sensitivity testing with a valid avidity result (IgG reactivity for the Architect CMV IgG Avidity assay; an OD of >0.300 for the Radim CMV IgG Avidity assay).