What Does a Ferritin Test Measure?

The ferritin test measures the concentration of ferritin, an intracellular protein that stores iron and releases it when needed. It reflects the amount of iron stored in the liver, bone marrow, and other tissues. Low ferritin levels typically indicate depleted iron reserves, often associated with iron deficiency anemia. High ferritin levels may signal iron overload, inflammation, liver disease, or chronic conditions. By evaluating ferritin, doctors gain insights into iron metabolism and assess the body’s ability to meet its iron needs for functions like red blood cell production and oxygen transport.