Ferritin, Serum or Plasma (Mass Concentration)

Why Is This Test Done?

Your healthcare provider may order a ferritin test to check for iron deficiency anemia, which can cause fatigue, weakness, or pale skin. It may also be used to evaluate iron overload in conditions like hemochromatosis, monitor liver disease, or assess response to treatment for certain blood disorders. Sometimes, it’s part of a broader evaluation for unexplained fatigue or symptoms like shortness of breath.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test if your blood is drawn early in the morning. Wear loose clothing for easy access to your arm. If you’re taking iron supplements, ask your provider whether to stop them temporarily, as they can affect results.

What Happens During the Test?

A healthcare professional will insert a small needle into your arm to draw a blood sample. You may feel a slight pinch, but it usually doesn’t cause discomfort. The blood will be sent to a lab for analysis. The process takes about 5 minutes, and you can resume normal activities afterward.

What Do the Results Mean?

Results are interpreted based on your overall health, symptoms, and medical history. Low ferritin levels may indicate iron deficiency, while very high levels could suggest iron overload or other conditions like inflammation or liver disease. Your provider will discuss the results in the context of your health and may recommend follow-up tests or treatments if needed.