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Ferritin Deficiency: Causes, Symptoms and Treatment

Ferritin deficiency refers to abnormally low ferritin levels in the blood, indicating depleted iron stores. Common symptoms include fatigue, hair loss, and difficulty concentrating.

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Things worth knowing about "Ferritin Deficiency"

Ferritin deficiency refers to abnormally low ferritin levels in the blood, indicating depleted iron stores. Common symptoms include fatigue, hair loss, and difficulty concentrating.

What Is Ferritin Deficiency?

Ferritin is a storage protein that binds iron within body cells and releases it when needed. Blood ferritin levels are considered the most reliable marker of the body´s iron reserves. Ferritin deficiency occurs when serum ferritin falls below the normal range – generally below 30 micrograms per liter (µg/L) in adults, though exact reference ranges may vary slightly between laboratories. Importantly, ferritin deficiency can exist before a full iron-deficiency anemia develops.

Causes

Ferritin deficiency arises when iron intake or absorption does not meet the body´s needs, or when iron losses are excessive. Common causes include:

Insufficient dietary iron intake: Diets low in iron-rich foods, such as vegan or vegetarian diets, can deplete iron stores over time.
Impaired intestinal absorption: Conditions such as celiac disease, Crohn´s disease, or a history of gastric surgery can reduce iron absorption.
Increased iron requirements: Pregnancy, breastfeeding, periods of rapid growth in children and adolescents, and intense physical exercise significantly increase the body´s demand for iron.
Blood loss: Heavy menstrual bleeding, gastrointestinal bleeding (e.g., from ulcers or polyps), or frequent blood donation can exhaust iron stores.
Chronic inflammatory conditions: Ongoing inflammation can interfere with normal iron metabolism and utilization.

Symptoms

The symptoms of ferritin deficiency are often non-specific and may be attributed to other causes. Typical complaints include:

Persistent fatigue and exhaustion
Hair loss (diffuse hair thinning)
Difficulty concentrating and memory problems
Pale skin and mucous membranes
Shortness of breath and reduced physical stamina
Brittle nails
Headaches and dizziness
Restless legs syndrome (RLS)

Diagnosis

Ferritin deficiency is primarily diagnosed through a blood test measuring serum ferritin levels. Additional parameters may be assessed to determine the extent of iron deficiency:

Serum iron and transferrin (the iron-transport protein)
Transferrin saturation
Complete blood count (hemoglobin, hematocrit, red blood cell indices)
Reticulocyte hemoglobin content

It is worth noting that ferritin is also an acute-phase reactant – elevated inflammation markers (e.g., CRP) can falsely normalize or even elevate ferritin levels, masking an underlying deficiency.

Treatment

Dietary Adjustments

For mild ferritin deficiency, targeted dietary changes may be sufficient. Iron-rich foods include red meat, legumes, dark leafy greens, whole grains, and pumpkin seeds. Consuming vitamin C alongside plant-based iron sources (non-heme iron) significantly enhances absorption. Conversely, coffee, black tea, and calcium-rich foods can inhibit iron absorption and should be consumed separately from iron-rich meals.

Iron Supplements

When deficiency is more pronounced, a doctor will typically recommend oral iron supplements (e.g., ferrous sulfate, ferrous gluconate, or ferric compounds). These are best taken on an empty stomach with a source of vitamin C to maximize absorption. Common side effects include stomach discomfort, nausea, and darkened stools.

Intravenous Iron Therapy

If oral supplements are not tolerated or intestinal absorption is impaired, iron can be administered intravenously via infusion. This allows for rapid and reliable replenishment of iron stores and is particularly useful in cases of severe deficiency.

Treating the Underlying Cause

Identifying and addressing the root cause of ferritin deficiency is always essential – for example, managing inflammatory bowel disease or investigating abnormally heavy menstrual periods.

At-Risk Groups

Certain groups are at particularly high risk of developing ferritin deficiency:

Women of childbearing age (due to menstrual blood loss)
Pregnant and breastfeeding women
Infants and young children during growth phases
Individuals following vegetarian or vegan diets
Competitive and endurance athletes
Older adults with limited dietary variety
People with chronic inflammatory bowel conditions

References

World Health Organization (WHO): Guideline – Iron supplementation in postpartum women. Geneva, 2016. Available at: https://www.who.int
Ganz T. – Iron deficiency and iron deficiency anemia. In: Harrison's Principles of Internal Medicine, 21st edition. McGraw-Hill, 2022.
Camaschella C. – Iron-deficiency anemia. New England Journal of Medicine, 2015; 372(19): 1832–1843. doi:10.1056/NEJMra1401038

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