Ferritin is a protein in the body that binds to iron. Most of the iron stored in the body is attached to ferritin. Ferritin is found in the liver, spleen, and bone marrow. The amount of ferritin in the blood may help indicate the amount of iron stored in your body. Levels can be utilized in diagnosis and monitoring of iron overload disorders, including sideroblastic anemia and hemochromatosis.