Ferritin Analysis – Blood Test for Iron Store Assessment
A ferritin analysis is a blood test that measures the level of ferritin, a protein that reflects the body's iron stores. It is used to diagnose iron deficiency or iron overload.
Things worth knowing about "Ferritin Analysis"
A ferritin analysis is a blood test that measures the level of ferritin, a protein that reflects the body's iron stores. It is used to diagnose iron deficiency or iron overload.
What Is a Ferritin Analysis?
A ferritin analysis is a laboratory diagnostic test that measures the concentration of ferritin in the blood. Ferritin is a storage protein that binds and releases iron within cells, particularly in the liver, spleen, and bone marrow. The level of ferritin in the blood is considered a reliable indicator of the body's total iron stores and plays a central role in diagnosing disorders of iron metabolism.
How Does the Test Work?
A venous blood sample is drawn and analyzed in the laboratory. The ferritin concentration in the blood serum or plasma is determined using immunological methods, most commonly an immunoassay such as ELISA or a chemiluminescence immunoassay. The test is straightforward, produces rapid results, and generally requires no special preparation, although fasting may improve the reliability of some accompanying tests.
Reference Values
Normal ferritin levels vary depending on age, sex, and the specific laboratory. Typical reference ranges for adults are:
- Women (premenopausal): approx. 12–150 µg/l
- Women (postmenopausal): approx. 12–263 µg/l
- Men: approx. 30–400 µg/l
- Children: age-dependent, generally 7–140 µg/l
Values below the reference range indicate depleted iron stores, while elevated values may point to iron overload or inflammatory processes.
When Is a Ferritin Analysis Ordered?
The ferritin analysis is requested in a variety of clinical situations, including:
- Suspected iron deficiency or iron deficiency anemia
- Evaluation of fatigue, exhaustion, and reduced physical performance
- Monitoring of iron replacement therapy
- Suspected hemochromatosis (hereditary iron overload disorder)
- Assessment of chronic conditions such as inflammatory bowel disease or kidney disease
- Screening in high-risk groups (e.g., pregnant women, women with heavy menstrual bleeding, athletes)
- Follow-up monitoring in known iron metabolism disorders
Interpretation of Results
Low Ferritin Level
A low ferritin value is a specific indicator of depleted iron stores and may occur in the following situations:
- Iron deficiency due to insufficient dietary intake (e.g., vegetarian or vegan diet)
- Increased iron requirements (pregnancy, growth phases)
- Chronic blood loss (e.g., heavy menstruation, gastrointestinal bleeding)
- Malabsorption disorders (e.g., celiac disease, Crohn's disease)
Elevated Ferritin Level
An elevated ferritin level does not necessarily indicate iron overload. Since ferritin is also an acute-phase protein, its level rises in response to inflammation, infection, liver disease, malignancies, or tissue damage. Possible causes of elevated ferritin include:
- Hemochromatosis (primary or secondary iron overload)
- Chronic liver disease (e.g., alcoholic liver disease, NAFLD/NASH)
- Inflammatory or autoimmune conditions (e.g., rheumatoid arthritis)
- Malignant diseases (e.g., lymphomas, leukemias)
- Hemolytic anemia
Clinical Relevance and Limitations
The ferritin analysis is a highly valuable diagnostic tool; however, results should always be interpreted in the context of other laboratory parameters. These include serum iron, transferrin, transferrin saturation, soluble transferrin receptor (sTfR), and a complete blood count. A normal or elevated ferritin level alone does not rule out functional iron deficiency, as ferritin concentrations can remain elevated during chronic inflammation even when iron supply to cells is insufficient.
References
- World Health Organization (WHO): Serum ferritin concentrations for the assessment of iron status and iron deficiency in populations. WHO/NMH/NHD/MNM/11.2. Geneva, 2011.
- Ganz T. Systemic iron homeostasis. Physiological Reviews. 2013;93(4):1721–1741. PubMed PMID: 24137020.
- Lopez A, Cacoub P, Macdougall IC, Peyrin-Biroulet L. Iron deficiency anaemia. The Lancet. 2016;387(10021):907–916. PubMed PMID: 26314490.
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