Ferritin Blood Test (MedlinePlus)

Tier 1: Established: peer-reviewed research or government health authority
Publisher: MedlinePlus (National Library of Medicine) · Published: September 3, 2026 · Accessed: September 3, 2026

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Claims this source supports

• A ferritin blood test can show how much iron you have stored in your body; too little or too much iron can cause serious health problems if not treated.
• The ferritin test may be ordered to check for low levels of iron before symptoms develop in people at high risk for iron deficiency, including those with heavy menstrual bleeding.
• Ferritin testing can help diagnose or rule out conditions related to iron levels, including iron deficiency anemia (too few red blood cells because you lack iron) and restless legs syndrome.