Ferritin is a protein that stores and releases iron in the body. It plays a crucial role in maintaining the right balance of iron, which is essential for various bodily functions, including the production of red blood cells. Ferritin can be found in many tissues, particularly in the liver, spleen, and bone marrow. The amount of ferritin in the blood can indicate a person's iron levels. Low ferritin levels may suggest iron deficiency, while high levels can indicate excess iron or inflammation. Doctors often measure ferritin as part of blood tests to assess overall health and diagnose conditions related to iron metabolism.