Serum Ferritin

Ferritin is the protein that stores iron, and the amount circulating in your blood mirrors how much iron your body has banked — making it the first and most sensitive marker of iron status. Low ferritin signals depleted stores and the earliest stage of iron deficiency, often before anaemia appears; very high levels can flag inflammation or iron overload. It responds to dietary iron, and to the vitamin C and other foods that change how well that iron is absorbed.

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