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The amount of Iron in the transport pool, in transit from the intestinal mucosa or reticulo-endotelial cells to tissues corresponds to less than 1% of Total Body Iron. Those tissues with higher requirements of Iron (erythroid precursors, placenta and liver) contain higher concentration of transferrin receptors. Iron Storage Once in tissues, Iron is stored as compounds – ferritin and hemosiderin – which are present primarily in the liver, RE cells and bone marrow. The amount of FE in storage compartment depends on Iron status which ranges from depleted to replete iron status. Iron bound to ferritin is more readily mobilized than iron bound to hemosiderin. So ferritin concentration expresses Body Iron Stores when assessing ID