The Ferritin test is a blood test that measures the level of ferritin, a protein that stores iron in the body. It is widely used to assess the body’s iron reserves and is helpful in diagnosing conditions related to iron deficiency (such as iron deficiency anemia) or iron overload (such as hemochromatosis). Low ferritin levels typically indicate depleted iron stores, while high levels may suggest inflammation, infection, liver disease, or iron overload. Ferritin is also known as an acute-phase reactant, meaning its levels can increase in inflammatory or infectious conditions even when iron stores are low. This test is often performed alongside other tests such as complete blood count (CBC), serum iron, and TIBC for more accurate interpretation. Abnormal ferritin results can help identify the cause of symptoms like fatigue, weakness, or dizziness and guide appropriate treatment.