Risks and limits of Ferritin Test

The ferritin test measures the body's iron storage protein. While commonly used to assess iron status, it has significant risks and limitations. Ferritin is an acute-phase reactant: levels rise during inflammation, infection, liver disease, or malignancy, even when iron stores are normal or low. Conversely, ferritin can be falsely normal in chronic inflammation. A single ferritin value is insufficient for diagnosis; it must be interpreted alongside transferrin saturation, serum iron, and CRP. Low ferritin indicates iron deficiency, but supplementation without clinical context risks overlooking hemochromatosis or other disorders. High ferritin may reflect iron overload or an acute-phase response. The test is not diagnostic for iron deficiency anemia or hemochromatosis alone. For consumer tests like MyBody-X, the ferritin test provides a snapshot but should not replace medical evaluation. Evidence is practice-based, not validated by large RCTs for home use. Caveat: results can cause unnecessary anxiety or false reassurance. Always consult a physician for interpretation.