Inflammation
Ferritin
LOINC 4537-7 · mcg/L
What it is
Ferritin is the protein that stores iron in your body. The blood level reflects how much iron you have in reserve.
Why it matters
It is the best single test of iron stores, key for diagnosing iron deficiency or iron overload.
What high values can mean
A higher value can mean iron overload, but ferritin also rises with inflammation, so context matters.
What low values can mean
A lower value is a reliable sign of low iron stores, often before anemia appears.
How to improve it
For low ferritin, iron-rich foods and, when advised, iron supplements rebuild stores; pair with vitamin C for absorption.
Food & lifestyle
Red meat, beans, lentils and leafy greens supply iron; vitamin C boosts absorption, while tea/coffee with meals reduces it.
Preparing for the test
A blood test; fasting is not required — follow your lab's instructions.
When to talk to a doctor
Discuss a low or high ferritin with a doctor, who interprets it alongside other iron tests and inflammation.
Related markers
Sources
- MedlinePlus (NIH)
- NIH Office of Dietary Supplements
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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