Common mistakes around Ferritin Test

Common mistakes around the Ferritin Test: First, ferritin is often interpreted as a standalone marker for iron deficiency, but it is an acute-phase reactant – it can be falsely elevated during inflammation or infection. Second, the test is frequently taken without regard to time of day or fasting status, which can affect results. Third, low ferritin is immediately assumed to indicate iron deficiency without ruling out other causes like blood loss, malabsorption, or chronic disease. Fourth, supplementation is started without medical supervision, risking iron overload in conditions like hemochromatosis. Fifth, reference ranges are not adjusted for age and sex – athletes often have different norms. Sixth, ferritin is not evaluated together with other iron parameters (transferrin saturation, hemoglobin). Evidence: practice-based and clinical guidelines. Caveat: single measurements are unreliable; consult a doctor for proper diagnosis.