What Is Ferritin?

What it is

Ferritin is the body's iron-storage protein; low ferritin indicates depleted iron stores.

Why it matters

The most useful marker for iron-deficiency anemia diagnosis.

Specimen

Whole blood / serum / plasma

Interpretation

Low = depleted iron stores (iron-deficiency anemia).

Limitations

Also an acute-phase reactant — can rise in inflammation.

Related test: Ferritin Rapid Test — specimen: WB / S / P