Ferritin Test: Measuring Stored Iron
Ferritin is a protein that stores iron inside cells, and a ferritin blood test estimates the body's iron stores. Low ferritin suggests iron depletion, often before anemia appears, making it useful for evaluating fatigue and other symptoms. Ferritin can rise with inflammation, infection, or liver disease, which can mask a deficiency, so it is usually interpreted with other iron studies and a complete blood count. Results help guide whether iron supplementation or further evaluation is needed.
Key Takeaways
- Ferritin is a protein that stores iron inside cells.
- A ferritin blood test estimates the body's iron stores.
- Low ferritin suggests iron depletion, often before anemia appears.
- Ferritin can rise with inflammation, infection, or liver disease, which can mask deficiency.
- It is usually interpreted with other iron studies and a complete blood count.
Frequently Asked Questions
What does a low ferritin level mean?
It generally indicates depleted iron stores, which can progress to iron deficiency anemia. A clinician can recommend next steps.
Do I need to fast for a ferritin test?
Fasting is usually not required, though it may be part of a panel that does require it.
Can ferritin be high without iron overload?
Yes. Inflammation, infection, and liver conditions can raise ferritin even when iron stores are not high.
Can I order a ferritin test directly?
Yes, ferritin testing is available through direct-access labs.
Sources
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