Also Known As
Serum Ferritin
Formal Name
Ferritin, serum
This article was last reviewed on
This article waslast modified on June 7, 2018.
At a Glance
Why Get Tested?

To determine your body's total iron storage capacity; to help diagnose iron deficiency or iron overload

When To Get Tested?

When you have low hemoglobin and hematocrit on a complete blood count (CBC); when your healthcare practitioner suspects that you may have too little iron (iron deficiency) or too much iron (iron overload) in the body

Sample Required?

A blood sample drawn from a vein in your arm

Test Preparation Needed?

You may be instructed to have your blood drawn in the morning and/or fast for 12 hours before the test; in this case, only water is permitted. Follow any instructions from your healthcare practitioner and/or from the laboratory performing the test.

You may be able to find your test results on your laboratory's website or patient portal. However, you are currently at Lab Tests Online. You may have been directed here by your lab's website in order to provide you with background information about the test(s) you had performed. You will need to return to your lab's website or portal, or contact your healthcare practitioner in order to obtain your test results.

Lab Tests Online is an award-winning patient education website offering information on laboratory tests. The content on the site, which has been reviewed by laboratory scientists and other medical professionals, provides general explanations of what results might mean for each test listed on the site, such as what a high or low value might suggest to your healthcare practitioner about your health or medical condition.

The reference ranges for your tests can be found on your laboratory report. They are typically found to the right of your results.

If you do not have your lab report, consult your healthcare provider or the laboratory that performed the test(s) to obtain the reference range.

Laboratory test results are not meaningful by themselves. Their meaning comes from comparison to reference ranges. Reference ranges are the values expected for a healthy person. They are sometimes called "normal" values. By comparing your test results with reference values, you and your healthcare provider can see if any of your test results fall outside the range of expected values. Values that are outside expected ranges can provide clues to help identify possible conditions or diseases.

While accuracy of laboratory testing has significantly evolved over the past few decades, some lab-to-lab variability can occur due to differences in testing equipment, chemical reagents, and techniques. This is a reason why so few reference ranges are provided on this site. It is important to know that you must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

For more information, please read the article Reference Ranges and What They Mean.

What is being tested?

Ferritin is a protein that contains iron and is the primary form of iron stored inside of cells. The small amount of ferritin that is released and circulates in the blood is a reflection of the total amount of iron stored in the body. This test measures the amount of ferritin in the blood.

Iron is an essential trace element and nutrient that, among other functions, is necessary for the production of healthy red blood cells (RBCs). The body cannot produce iron and must absorb it from the foods we eat or from supplements.

In healthy people, most of the iron absorbed by the body is incorporated into the hemoglobin of red blood cells. Most of the remaining is stored as ferritin or as hemosiderin, with additional small amounts used to produce other proteins such as myoglobin and some enzymes. Ferritin and hemosiderin are present primarily in the liver but also in the bone marrow, spleen, and skeletal muscles.

When the level of iron is insufficient to meet the body's needs, the level of iron in the blood drops, iron stores are depleted and ferritin levels decrease. This may occur because:

  • Not enough iron is consumed (either foods or supplements)
  • The body is unable to absorb iron from the foods eaten in conditions such as celiac disease
  • There is an increased need for iron such as during pregnancy or childhood, or due to a condition that causes chronic blood loss (e.g., peptic ulcer, colon cancer).

Insufficient levels of circulating and stored iron may eventually lead to iron deficiency anemia (decreased hemoglobin). In the early stage of iron deficiency, no physical effects are usually seen and the amount of iron stored may be significantly depleted before any signs or symptoms of iron deficiency develop. If a person is otherwise healthy and anemia develops over a long period of time, symptoms seldom appear before the hemoglobin in the blood drops below the lower limit of normal.

However, as the iron-deficiency progresses, symptoms eventually begin to appear. The most common symptoms of iron deficiency anemia include fatigue, weakness, dizziness, headaches and pale skin. (Read the article on Anemia to learn more.)

Conversely, iron storage and ferritin levels increase when more iron is absorbed than the body needs. Absorbing too much iron over time can lead to the progressive buildup of iron compounds in organs and may eventually cause their dysfunction and failure. An example of this is hemochromatosis, a rare genetic disease in which the body absorbs too much iron, even on a normal diet. Additionally, iron overload can occur when a person undergoes repeated blood transfusions.

Accordion Title
Common Questions
  • How is it used?

    The ferritin test is used to assess a person's iron stores in the body. The test is often ordered along with an iron level and total iron-binding capacity (TIBC, calculated based on blood level of transferrin) to detect a low iron level (iron deficiency) or too much iron in the body (iron overload) as well as to assess the severity of these conditions.

  • When is it ordered?

    The ferritin test may be ordered, along with other iron tests, when a routine complete blood count (CBC) shows that a person's hemoglobin and hematocrit are low and their red blood cells are smaller and paler than normal (microcytic and hypochromic), suggesting iron deficiency anemia even though other clinical symptoms may not have developed yet.

    A ferritin test as well as other iron-related tests may be ordered when a person develops signs and symptoms of iron-deficiency anemia such as:

    • Chronic fatigue/tiredness
    • Weakness
    • Dizziness
    • Headaches
    • Pale skin (pallor)

    A ferritin level may also be ordered when iron overload is suspected. Signs and symptoms of iron overload will vary from person to person and tend to worsen over time. They are due to iron accumulation in the blood and tissues. They may include:

    • Joint pain
    • Fatigue, weakness
    • Weight loss
    • Lack of energy
    • Abdominal pain
    • Loss of sex drive
    • Organ damage, such as in the heart and liver

    To confirm the presence of iron overload, other iron tests (iron, TIBC) and a genetic test for hereditary hemochromatosis may be ordered as well.

  • What does the test result mean?

    Ferritin levels are often evaluated in conjunction with other iron tests. A summary of the changes in iron tests seen in various diseases of iron status is shown in the table below.

     

    Disease Iron TIBC/Transferrin UIBC

    %Transferrin

    Saturation

    Ferritin
    Iron Deficiency Low High High Low Low
    Hemochromatosis/Hemosiderosis High Low Low High High
    Chronic Illness Low Low/Normal Low/Normal Low/Normal High/Normal
    Hemolytic Anemia High Normal/Low Low/Normal High High
    Sideroblastic Anemia Normal/High Normal/Low Low/Normal High High
    Iron Poisoning High Normal Low High Normal

    Iron deficiency
    The early stage of iron deficiency is the slow depletion of iron stores. This means there is still enough iron to make red cells but the stores are being used up without adequate replacement. The serum iron level may be normal in this stage, but the ferritin level will be low.

    As iron deficiency continues, all of the stored iron is used and the body tries to compensate by producing more transferrin to increase iron transport. The serum iron level continues to decrease and transferrin and TIBC and UIBC increase. As this stage progresses, fewer and smaller red blood cells are produced, eventually resulting in iron deficiency anemia. Transferrin saturation is decreased with iron deficiency.

    Iron overload
    If the iron level and transferrin saturation are high, the TIBC, UIBC and ferritin are normal and the person has a clinical history consistent with iron overdose, then it is likely that the person has iron poisoning. Iron poisoning occurs when a large dose of iron is taken all at once or over a short period of time. Iron poisoning in children is almost always acute, occurring in children who ingest their parents' iron supplements. In some cases, acute iron poisoning can be fatal. In patients with chronic iron overload, ferritin levels increase.

    A person who has mutations in the HFE gene is diagnosed with hereditary hemochromatosis. However, while many people who have hemochromatosis will have no symptoms for their entire life, others will start to develop symptoms such as joint pain, abdominal pain, and weakness in their 30's or 40's. Men are affected more often than women because women lose blood during their reproductive years through menstruation.

    Iron overload may also occur in people who have hemosiderosis and in those who have had repeated transfusions. This may occur with sickle cell anemiathalassemia major, or other forms of transfusion-dependent anemia. The iron from each transfused unit of blood stays in the body, eventually causing a large buildup in the tissues. Some persons with alcoholism and with chronic liver disease also develop iron overload.

  • Is there anything else I should know?

    Normally, most ferritin is found inside of cells with only a small amount in the blood. Patients with iron overload have high ferritin levels. However, ferritin levels can become elevated under certain condition (e.g., acute illness) even though the total amount of iron in the body is normal.

  • My iron level is normal, but my ferritin level is low. Why is that?

    The development of iron deficiency anemia is a gradual process. If your body is not taking in enough iron, your body first uses the iron that is stored in tissues (i.e., ferritin) and blood levels of ferritin will begin to decrease. If not corrected, the stored iron begins to be depleted as it is used in the production of red blood cells. In the early stages of iron-deficiency, blood levels of iron can be normal while stored iron, and therefore ferritin levels, will begin to decrease.

  • I know eating foods high in iron or taking iron supplements will increase my iron level, but will it also increase my ferritin level?

    Yes. Taking in more iron will increase the level of iron in your body. If the level of iron in your body increases and is more than your body requires, then your body will begin to store more iron in the form of ferritin.

  • What other conditions may alter ferritin levels?

    Increased levels may be seen in alcohol abuse, acute hepatitis, and infections.

  • Who should take iron supplements?

    The people who typically need iron supplements are pregnant women and those with documented iron deficiency. Young women who become anemic due to poor dietary intake and have chronic and/or excessive loss of blood during their menstrual cycle may require iron supplements. People should not take iron supplements before talking to their healthcare practitioner as excess iron can cause chronic iron overload. An overdose of iron pills can be toxic, especially to children.

  • Is there any way to cure iron overload?

    If it is due to a temporary condition or ingestion of iron supplements, then it will likely resolve on its own once the condition is resolved or supplement ingestion is stopped. If it is due to hemochromatosis or to a chronic disease, then it cannot be cured; careful management by your healthcare practitioner is required. In severe cases, periodic removal of a prescribed amount of blood, also known as therapeutic phlebotomy, may be necessary.

View Sources

Sources Used in Current Review

Devkota, B. (2014 January 16 Updated). Ferritin. Medscape Drugs and Diseases Available online at http://emedicine.medscape.com/article/2085454-overview. Accessed on March 2018.

(© 1995– 2018). Ferritin, Serum. Mayo Clinic. Mayo Medical Laboratories. Available online at http://www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/88153. Accessed on March 2018.

Duchini, A. et al (2017 April 4 Updated). Hemochromatosis. Medscape Drugs and Diseases. Available online at http://emedicine.medscape.com/article/177216-overview. Accessed on March 2018.

Genzen, J. and Straseski, J. (2016 May Updated). Anemia. ARUP Consult. Available online at https://arupconsult.com/content/anemia. Accessed on March 2018.

Nanda, R. (2015 February 13 Updated). Iron Deficiency Anemia. MedlinePlus Medical Encyclopedia Available online at https://www.nlm.nih.gov/medlineplus/ency/article/000584.htm. Accessed on March 2018.

Tietz Textbook of Clinical Chemistry and Molecular Diagnostics. Nader Rifai. 6th edition, Elsevier Health Sciences; 2017. Pg. 742.

Wintrobe's Clinical Hematology. 12th ed. Greer J, Foerster J, Rodgers G, Paraskevas F, Glader B, Arber D, Means R, eds. Philadelphia, PA: Lippincott Williams & Wilkins: 2009. Pg. 818.

Sources Used in Previous Reviews

Corbett, JV. Laboratory Tests & Diagnostic Procedures with Nursing Diagnoses, 4th ed. Stamford, Conn.: Appleton & Lang, 1996. Pp. 34-35, 41-43.

Frey, Rebecca J. Iron Tests. Chapter in: Gale Encyclopedia of Medicine, Edition One, 1999 Gale Research Group, Pg. 1648.

Witte DL, Crosby WH, Edwards CQ, Fairbanks VG, Mitros FA: Practice guideline development task force of the College of American Pathologists.

Boston University Medical Center: Community Outreach Health Information System. Available online at http://www.bu.edu/cohis/cardvasc/blood/anemia.htm#prevent.

Lyon, Elaine and Frank, Elizabeth L. Hereditary Hemochromatosis Since Discovery of the HFE Gene. Clinical Chemistry 47:1147-1156 (Jul 2001).

Pagana, K. D. & Pagana, T. J. (© 2007). Mosby's Diagnostic and Laboratory Test Reference 8th Edition: Mosby, Inc., Saint Louis, MO. Pp 434-435.

Wu, A. (© 2006). Tietz Clinical Guide to Laboratory Tests, 4th Edition: Saunders Elsevier, St. Louis, MO. Pp 392-393.

Gersten, T. (Updated 2009 January 12). Ferritin. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003490.htm. Accessed June 2009.

(Modified 2009 March 13). About Iron. Iron Disorders Institute [On-line information]. Available online at http://www.irondisorders.org/Disorders/about.asp. Accessed June 2009.

(Updated 2007 August 24). Dietary Supplement Fact Sheet: Iron. NIH Office of Dietary Supplements [On-line information]. Available online at http://ods.od.nih.gov/factsheets/iron.asp. Accessed June 2009.

Rathz, D. et. al. (Updated 2009 February 02). Toxicity, Iron. eMedicine [On-line information]. Available online at http://emedicine.medscape.com/article/166933-overview.

Chen, Y. (Updated 2009 April 05). Iron Deficiency Anemia. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/000584.htm. Accessed June 2009.

Henry's Clinical Diagnosis and Management by Laboratory Methods. 21st ed. McPherson RA and Pincus MR, eds. Philadelphia: 2007, Pg 506.

Devkota, B. (Updated 2012 May 21). Ferritin. Medscape Reference [On-line information]. Available online at http://emedicine.medscape.com/article/2085454-overview. Accessed May 2013.

Gersten, T. (Updated 2012 February 8). Ferritin. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003490.htm. Accessed May 2013.

(© 1995–2013). Ferritin, Serum. Mayo Clinic Mayo Medical Laboratories [On-line information]. Available online at http://www.mayomedicallaboratories.com/test-catalog/Overview/8689. Accessed May 2013.

(Update 2013 March). Hemochromatosis. ARUP Consult [On-line information]. Available online at http://www.arupconsult.com/Topics/Hemochromatosis.html?client_ID=LTD#tabs=6. Accessed April 2013.

Hämäläinen, P. et. al. (2012). Erythropoietin, Ferritin, Haptoglobin, Hemoglobin and Transferrin Receptor in Metabolic Syndrome, A Case Control Study. Medscape Reference Cardiovasc Diabetol. 2012;11(116) [On-line information]. Available online at http://www.medscape.com/viewarticle/774074. Accessed May 2013.

Lichtin, A. (Revised 2008 June). Iron Deficiency Anemia (Anemia of Chronic Blood Loss; Chlorosis). Merck Manual for Healthcare Professionals [On-line information]. Available online through http://www.merckmanuals.com. Accessed May 2013.

Pagana, K. D. & Pagana, T. J. (© 2011). Mosby's Diagnostic and Laboratory Test Reference 10th Edition: Mosby, Inc., Saint Louis, MO. Pp 443-444.

Clarke, W., Editor (© 2011). Contemporary Practice in Clinical Chemistry 2nd Edition: AACC Press, Washington, DC. Pg 536.

McPherson, R. and Pincus, M. (© 2011). Henry's Clinical Diagnosis and Management by Laboratory Methods 22nd Edition: Elsevier Saunders, Philadelphia, PA. Pg 560.

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