What do studies say about Ferritin Test?

The ferritin test is a well-established laboratory marker for assessing body iron stores. Studies show that low ferritin (<30 ng/ml) is a sensitive indicator of iron deficiency, while elevated levels may suggest iron overload (e.g., hemochromatosis) or an acute-phase response. However, ferritin is an acute-phase reactant; inflammation, infection, or liver disease can falsely elevate levels even when iron stores are low. Therefore, ferritin should be interpreted alongside CRP, transferrin saturation, and soluble transferrin receptor for accurate assessment. The evidence for its clinical use is strong (human-strong), but interpretation without context is error-prone. Consumer lab tests that measure ferritin alone without inflammatory markers provide an incomplete picture. Caveat: A normal ferritin does not rule out functional iron deficiency, especially in chronic disease. Medical consultation is essential for reliable evaluation.