part of part of has part has part characteristic of has modifier ferritin complex Increased circulating ferritin concentration Ferritin is a ubiquitous intracellular protein that stores iron. Ferritin levels measured in serum usually have a direct correlation with the total amount of iron stored in the body, but ferritin levels may also be increased with anemia of chronic disease or in the course of an acute phase reaction. Acute phase response Abnormal circulating ferritin concentration abnormal increased amount blood serum