Ferritin (Iron Stores) Level Interpreter
Understand where your ferritin result falls within general reference ranges. Ferritin reflects the body's iron stores.
Ferritin reference ranges differ between men and women.
Found on your blood test result, usually labelled Ferritin. Units are typically µg/L (same as ng/mL).
What ferritin measures
Ferritin is a protein that stores iron in the body, and a blood ferritin test is the most commonly used way to assess how much iron you have in reserve. Low ferritin is one of the earliest and most specific signs of iron deficiency, often falling before haemoglobin drops and before anaemia develops. This is why ferritin is central to investigating tiredness and suspected iron deficiency. This tool shows where a ferritin value sits within general reference ranges, for education only.
Why ferritin must be interpreted in context
Ferritin is an acute-phase reactant, meaning it rises with inflammation, infection, liver conditions and some other situations independently of iron stores. So a normal or high ferritin does not always rule out iron deficiency if inflammation is present, and a high ferritin does not automatically mean iron overload. Doctors interpret ferritin alongside other iron studies such as transferrin saturation, symptoms and clinical context, rather than in isolation.
Low ferritin and iron deficiency
A low ferritin is the hallmark of depleted iron stores and can cause tiredness, weakness and shortness of breath even before full anaemia develops. Identifying why ferritin is low is an important part of treatment — common causes include blood loss including heavy periods, low dietary iron, increased needs in pregnancy, and absorption problems. A doctor can confirm iron deficiency and look into its cause. Read our Iron Deficiency guide for a full overview.
Frequently Asked Questions
Reference ranges vary by laboratory and sex, but broadly a ferritin below about 30 µg/L strongly suggests low iron stores, while upper limits are often around 200 µg/L for women and 400 µg/L for men. Your own report's range and your doctor's interpretation are what matter, as ferritin is affected by inflammation and other factors.
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Sources & References
- 1.NHS. Iron deficiency anaemia.
- 2.World Health Organization. Serum ferritin concentrations for assessing iron status.
- 3.British Society for Haematology. Guideline on the laboratory investigation of iron deficiency.
LifeCheckIQ content is based on peer-reviewed research, recognised clinical guidelines, and authoritative medical sources, and is reviewed by Deborah Adotso, General Nurse, for clinical accuracy.
Medical Disclaimer: This tool is for informational and educational purposes only. Results are not a medical diagnosis. Always consult a qualified healthcare professional for medical advice, diagnosis, or treatment. In an emergency, call your local emergency number or visit the nearest hospital immediately.