Your ferritin level is the best indicator of your iron stores. Ferritin is a protein that stores iron and releases it gradually when needed. Unlike serum iron (which fluctuates), ferritin provides a stable picture of your iron status.
Normal values
Men: 30-300 ug/L. Pre-menopausal women: 15-150 ug/L. Post-menopausal women: 30-300 ug/L. Many doctors consider 30 ug/L the minimum for optimal functioning in women.
Ferritin too low
Indicates depleted iron stores. Causes: insufficient dietary iron, heavy menstruation, pregnancy, reduced absorption (coeliac disease). Symptoms: fatigue, concentration problems, pallor, hair loss, restless legs.
Ferritin too high
May indicate excess iron, but most commonly reflects inflammation. Other causes: liver disease, haemochromatosis, excessive supplementation. CRP can help distinguish inflammation from true iron overload.
Frequently asked questions
Can ferritin be normal despite iron deficiency?
Yes, if inflammation is present. Inflammation artificially raises ferritin. Additional tests (transferrin saturation) can reveal the true iron status.
How quickly does ferritin rise with supplementation?
Ferritin rises slower than haemoglobin. It may take 3-6 months to fully replenish iron stores.
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