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Ferritin is the protein your body uses to store iron, and your ferritin level is the most sensitive early indicator of iron status — it can be depleted for months while your hemoglobin and red blood cell count still appear 'normal.' Low ferritin is the most common explanation for fatigue, hair loss, breathlessness, and poor concentration that a standard blood count misses. Very high ferritin, conversely, signals iron overload, active inflammation, or liver disease.
Also known as: Ferr, Ferritin, Ferritin Level, Ferritin, Serum
High ferritin signals iron overload, chronic inflammation, liver disease, or metabolic syndrome. Low ferritin is the earliest marker of iron depletion, causing fatigue and hair loss well before anemia develops.
Standard labs flag below 10-30 ng/mL. Functional targets are 50-150 ng/mL for women and 75-150 ng/mL for men. Ferritin above 200 ng/mL in women warrants investigation.