Definition

The ferritin blood test measures the level of ferritin in the blood.

Ferritin is a protein inside your cells that stores iron. It allows your body to use the iron when it needs it. A ferritin test indirectly measures the amount of iron in your blood.

Alternative Names

Serum ferritin level; Iron deficiency anemia – ferritin

How the Test is Performed

A blood sample is needed.

How to Prepare for the Test

Your health care provider may tell you not to eat anything (to fast) for 12 hours before the test. You may also be told to have the test done in the morning.

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away.

Why the Test is Performed

The amount of ferritin in the blood (serum ferritin level) is directly related to the amount of iron stored in your body. Iron is needed to make healthy red blood cells. These cells carry oxygen to body tissues.

Your provider may recommend this test if you have signs or symptoms of anemia due to low iron. Anemia is a condition in which the body does not have enough healthy red blood cells.