Serum Iron: Normal Values, Meaning & Diagnosis
Serum iron refers to the concentration of iron measured in the liquid portion of the blood. It is a key laboratory marker used to diagnose iron deficiency or iron overload.
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Serum iron refers to the concentration of iron measured in the liquid portion of the blood. It is a key laboratory marker used to diagnose iron deficiency or iron overload.
What Is Serum Iron?
Serum iron refers to the amount of iron circulating in the liquid portion of the blood, known as the serum. In the bloodstream, iron is primarily bound to a transport protein called transferrin, which carries it to the organs and tissues that need it. The serum iron level is an important laboratory value that provides insight into the body's iron metabolism.
Biological Importance of Iron
Iron is an essential trace element that serves many vital functions in the human body:
- Component of hemoglobin in red blood cells – responsible for oxygen transport
- Component of myoglobin in muscle tissue – oxygen storage in muscles
- Involved in cellular energy production (mitochondria)
- Essential for a functioning immune system
- Required for DNA synthesis and cell division
Normal Serum Iron Values
Reference ranges for serum iron may vary slightly depending on the laboratory and measurement method. General guidelines are as follows:
- Men: approximately 60–170 µg/dl (10.7–30.4 µmol/l)
- Women: approximately 37–145 µg/dl (6.6–26.0 µmol/l)
- Children: age-dependent, generally 50–120 µg/dl
Serum iron levels are subject to diurnal variation – they tend to be highest in the morning. For this reason, blood samples should ideally be taken in the morning after fasting.
Diagnosis – When Is Serum Iron Measured?
Serum iron is determined as part of a blood test and is typically ordered in the following situations:
- Suspected iron deficiency or iron deficiency anemia
- Investigation of fatigue, paleness, or reduced physical performance
- Monitoring ongoing iron therapy
- Suspected hemochromatosis (hereditary iron overload disorder)
- Chronic conditions such as kidney disease or inflammatory disorders
- Nutritional deficiencies
Serum iron alone is not sufficient for a complete assessment of iron metabolism. It is therefore usually measured together with other parameters, including ferritin (iron storage), transferrin and transferrin saturation, as well as a full blood count.
Elevated Serum Iron Levels
A high serum iron level may indicate the following conditions:
- Hemochromatosis – hereditary iron overload
- Hemolysis – increased breakdown of red blood cells
- Liver damage or liver disease (e.g., hepatitis, cirrhosis)
- Excessive iron intake through supplements or transfusions
- Aplastic or megaloblastic anemia
Low Serum Iron Levels
A low serum iron level may be caused by the following:
- Iron deficiency anemia – the most common form of anemia worldwide
- Chronic blood loss (e.g., menstruation, gastrointestinal bleeding)
- Insufficient dietary iron intake (e.g., vegan or vegetarian diets)
- Reduced iron absorption in the intestine (e.g., celiac disease, Crohn's disease)
- Increased iron requirements (pregnancy, breastfeeding, growth phases)
- Chronic inflammatory diseases (anemia of chronic disease)
Treatment of Abnormal Values
Iron Deficiency
Treatment of iron deficiency depends on the underlying cause and severity. Options include:
- Dietary adjustments: iron-rich foods such as red meat, legumes, leafy green vegetables, and whole grains
- Simultaneous intake of vitamin C to enhance iron absorption
- Oral iron supplements (e.g., ferrous sulfate, ferrous fumarate)
- Intravenous iron administration for severe deficiency or absorption disorders
Iron Overload
In cases of iron overload such as hemochromatosis, the following treatment options are available:
- Phlebotomy (therapeutic bloodletting) – regular blood removal to reduce iron levels
- Chelation therapy – medications that bind excess iron for excretion
References
- World Health Organization (WHO): Iron Deficiency Anaemia – Assessment, Prevention, and Control. Geneva, 2001. Available at: https://www.who.int/nutrition/publications/micronutrients/anaemia_iron_deficiency/en/
- Kasper DL et al.: Harrison's Principles of Internal Medicine, 21st edition. McGraw-Hill Education, 2022.
- Lopez A, Cacoub P, Macdougall IC, Peyrin-Biroulet L: Iron deficiency anaemia. The Lancet. 2016;387(10021):907–916. doi:10.1016/S0140-6736(15)60865-0
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