About the Test

A Ferritin test measures the amount of this protein in your blood to show how much iron your body has in reserve. Low Ferritin: This means your iron stores are empty. It often leads to iron deficiency and can cause fatigue, weakness, dizziness, and pale skin. High Ferritin: This means you have too much stored iron, or it can signal inflammation, infection, liver disease, or chronic illness because ferritin rises when the body deals with stress or swelling.