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Serum Ferritin Marker – Meaning, Normal Values and Diagnosis

The serum ferritin marker is a laboratory value that reflects the body´s iron storage status. It is used to diagnose iron deficiency or iron overload.

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The serum ferritin marker is a laboratory value that reflects the body´s iron storage status. It is used to diagnose iron deficiency or iron overload.

What Is the Serum Ferritin Marker?

The serum ferritin marker refers to the measurement of ferritin levels in blood serum. Ferritin is an endogenous storage protein that binds and stores iron in a non-toxic and biologically available form. The concentration of ferritin in the serum is considered a reliable indicator of the body´s total iron stores. The test is routinely used in diagnostics to detect both iron deficiency and iron overload (hemochromatosis).

Biological Function of Ferritin

Ferritin is present in virtually all body cells, particularly in the liver, spleen, and bone marrow. It stores iron intracellularly and releases it when needed. A small fraction of ferritin enters the bloodstream and is measurable as serum ferritin. This serum fraction correlates closely with the total iron reserves of the body, which is why the serum ferritin marker is considered the gold standard for assessing iron status.

Normal Values and Reference Ranges

Reference values for serum ferritin vary depending on age, sex, and the laboratory. Generally accepted reference ranges are:

Adult men: 30–400 µg/l
Adult women (premenopausal): 13–150 µg/l
Adult women (postmenopausal): 13–200 µg/l
Children: depending on age, typically 7–140 µg/l

Values below the reference range indicate iron deficiency, while significantly elevated values may suggest iron overload or an inflammatory condition.

When Is the Serum Ferritin Marker Measured?

The serum ferritin marker is used in the following clinical situations:

Suspected iron deficiency anemia (e.g., fatigue, pallor, reduced performance)
Monitoring of ongoing iron therapy
Evaluation of hemochromatosis (hereditary iron storage disease)
Monitoring in chronic diseases (e.g., inflammatory bowel disease, chronic kidney disease)
Screening in at-risk groups such as pregnant women, athletes, and vegans

Interpretation of the Serum Ferritin Marker

Low Ferritin Level

A low serum ferritin value (below approximately 12–30 µg/l, depending on guidelines) is a reliable sign of depleted iron stores. It is often the first detectable change in developing iron deficiency, even before other blood parameters such as hemoglobin begin to fall.

Elevated Ferritin Level

An elevated ferritin level can point to various causes:

Iron overload due to hemochromatosis or frequent blood transfusions
Acute and chronic inflammation – ferritin is an acute-phase protein and rises during inflammatory responses
Liver diseases (e.g., cirrhosis, hepatitis)
Certain malignancies
Metabolic disorders such as metabolic syndrome

When ferritin is elevated due to inflammation, the value does not reliably reflect the actual iron status. In such cases, additional parameters such as transferrin saturation, soluble transferrin receptor, and CRP must be assessed.

Diagnostic Approach

The serum ferritin marker is typically measured as part of an iron status panel, which includes the following parameters:

Serum ferritin
Serum iron
Transferrin and transferrin saturation
Complete blood count (hemoglobin, MCV, MCH)
CRP (C-reactive protein) to assess possible inflammation

The combined evaluation of these values enables a precise assessment of iron status and differentiation between true iron deficiency and functional iron deficiency in the context of inflammation.

Treatment for Abnormal Serum Ferritin Values

For Iron Deficiency

When iron deficiency is confirmed, treatment depends on the underlying cause and severity:

Dietary adjustments: increasing intake of iron-rich foods (red meat, legumes, dark leafy vegetables)
Oral iron supplements: e.g., ferrous sulfate, ferrous gluconate, or iron bisglycinate
Intravenous iron therapy: for severe anemia or intolerance to oral preparations

For Iron Overload

In cases of hemochromatosis or other forms of iron overload, the following measures are used:

Therapeutic phlebotomy: regular blood draws to reduce iron stores
Chelation therapy: use of iron-binding agents (chelators) when phlebotomy is contraindicated

References

World Health Organization (WHO): Haemoglobin concentrations for the diagnosis of anaemia and assessment of severity. Geneva, 2011. Available at: https://www.who.int
Camaschella C. Iron-deficiency anemia. New England Journal of Medicine. 2015;372(19):1832–1843.
Lopez A. et al. Iron deficiency anaemia. The Lancet. 2016;387(10021):907–916.

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