Purpose: To describe the relationship during pregnancy of an iron stores measure, serum ferritin, and an intracellular iron measure, zinc protoporphyrin/heme ratio (ZPP/H).Methods: Retrospective analyses of measurements of ferritin and ZPP/H from 316 iron-supplemented prenatal patients at a public hospital clinic. Each ferritin value was corrected for dilution, using formulas for estimating ....