What this marker measures
A normal or high ferritin does not always mean iron status is fine — inflammation can falsely elevate ferritin. Conversely, low ferritin is highly specific for iron deficiency when inflammation markers are normal.
High or low: what it can mean
High Ferritin
High ferritin can reflect iron overload (as in hemochromatosis) but more commonly in everyday clinical practice it is elevated due to inflammation, infection, liver disease, or metabolic syndrome, as ferritin is an acute-phase reactant.
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Low Ferritin
Low ferritin is the earliest laboratory sign of iron depletion — it drops before hemoglobin or iron levels change. This can cause fatigue, hair loss, cold intolerance, and reduced exercise capacity, even before overt anemia develops.
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Lifestyle considerations
- •Iron-rich foods: red meat, liver, shellfish, lentils, spinach
- •Vitamin C with iron-rich meals improves absorption; tea and coffee consumed with meals reduce it
Frequently asked questions
What is Ferritin?
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Ferritin is a protein that stores iron inside cells. Blood ferritin levels reflect the body's total iron stores and are the most sensitive blood marker for iron deficiency.
What does Ferritin measure?
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A normal or high ferritin does not always mean iron status is fine — inflammation can falsely elevate ferritin. Conversely, low ferritin is highly specific for iron deficiency when inflammation markers are normal.
What does high Ferritin mean?
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High ferritin can reflect iron overload (as in hemochromatosis) but more commonly in everyday clinical practice it is elevated due to inflammation, infection, liver disease, or metabolic syndrome, as ferritin is an acute-phase reactant.
What does low Ferritin mean?
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Low ferritin is the earliest laboratory sign of iron depletion — it drops before hemoglobin or iron levels change. This can cause fatigue, hair loss, cold intolerance, and reduced exercise capacity, even before overt anemia develops.
What supports healthy Ferritin levels?
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Iron-rich foods: red meat, liver, shellfish, lentils, spinach. Vitamin C with iron-rich meals improves absorption; tea and coffee consumed with meals reduce it
Related biomarkers
Editorial note
LabTestly explains lab markers using plain-English educational content. Reference ranges may vary by laboratory and should be interpreted with a clinician.
Educational content · Editorially reviewed for clarity · Last updated
Common sources used for lab-test education
Not medical advice
This page is for general understanding only and does not replace medical advice from your clinician. Reference ranges can vary by laboratory, age, sex, pregnancy status, medications, and clinical context.