ROC comparison of peripheral blood tests (▿, CHr; ▾, MCV; ●, transferrin saturation; O, Ferritin) for the detection of absent bone marrow iron stores.

(A) All patients. (B) Patients with MCV more than 100 are excluded from analysis. Diagnostic cutoff concentrations spanned the full range of sensitivity and specificity for all analytes. Areas under the curves (± 95% confidence interval) are presented in Table 1.