Ferritin is a protein found inside cells that stores iron so your body can use it later. A ferritin test indirectly measures the amount of iron in your blood.
The amount of ferritin in your blood (serum ferritin level) is directly related to the amount of iron stored in your body.
Serum ferritin level
Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine...
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Source: ADAM Encyclopedia
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