Serum ferritin may be increased as an acute phase reactant in some patients with iron deficiency and a chronic inflammatory condition. The erythrocyte sedimentation rate (ESR) is an indicator of the inflammatory response. It can be used to predict which patients with "normal" ferritin levels in the range of 10-90 ng/mL could be iron deficient.


(1) ferritin in ng/mL

(2) Westergren ESR in mm in first hour


z  value =

= (1.311 * (ferritin in ng/mL)) - (0.6213 * (Westergren ESR in mm/h)) - 12.17


probability iron deficient =

= 1 / (1 + (e ^ z))

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