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What does ferritin mean? — A plain-English guide to your iron storage marker

Ferritin is your body's iron savings account. When it's low, you can feel tired before standard anemia shows up on a blood test. When it's high, the reading often points to inflammation rather than "too much iron." The number on its own rarely tells the full story — your trend over time and the rest of your panel matter more. This is one of those markers your doctor probably mentions in passing and doesn't have the appointment minutes to fully explain. Here's the longer version.