Ferritin is an intracellular protein that stores iron and releases it in a controlled fashion. The amount of ferritin stored reflects the amount of iron stored. It acts as a buffer against iron deficiency and iron overload.

If someone with Crohn's Disease is showing signs of anemia but ferritin levels are normal or high (meaning that cells have plenty of iron) then the person may have Anemia of Chronic Disease rather than Iron Deficiency Anemia. In people with Iron Deficiency Anemia, ferritin levels should be low.

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