When is Ferritin Test actually useful?

A ferritin test is useful when iron deficiency or iron overload is suspected. Ferritin is the main iron storage protein – low levels reliably indicate depleted iron stores, while high levels can signal iron overload (e.g., hemochromatosis) or an inflammatory response. However, ferritin is an acute-phase reactant: it can be elevated due to infection, chronic inflammation, or liver disease even when iron stores are normal. Therefore, ferritin should always be interpreted alongside other markers like transferrin saturation, CRP, and complete blood count. For routine screening in healthy individuals without risk factors, the test has limited value. The evidence for its clinical utility in targeted diagnostic scenarios (iron deficiency anemia, hemochromatosis) is strong, but a single ferritin value without clinical context can be misleading.