Serum Iron Blood Test: Normal Range, High & Low Levels

Serum iron measures the amount of iron circulating in your blood bound to transferrin. Normal ranges are 65–175 µg/dL for men and 50–170 µg/dL for women. Low levels indicate iron deficiency and risk of anemia, while high levels suggest iron overload or impaired iron use.

Contents

→ Result interpretation
→ Check your value Serum Iron
→ What is Serum Iron
→ Reference ranges
→ Causes of abnormal values
→ Serum Iron in combination with other markers
→ Possible symptoms
→ When to see a doctor
→ What to do if abnormal
→ Frequently asked questions
→ Related markers

Result interpretation Serum Iron

What your result means based on common reference ranges

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Normal

Serum iron is within range, indicating balanced iron transport and adequate availability for red blood cell production.

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Mildly elevated

Slight elevation often reflects recent iron intake from food or supplements and is usually temporary.

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Significantly elevated

Marked elevation indicates iron overload, where excess iron accumulates and can damage organs such as the liver.

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Below normal

Low levels indicate depleted circulating iron and impaired hemoglobin production, consistent with iron deficiency anemia.

🔬 Check your value Serum Iron

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Serum Iron, µg/dL

Sex

Age

What is Serum Iron?

Serum iron reflects the amount of iron currently available in the bloodstream for processes such as hemoglobin production and cellular metabolism. It represents iron transport rather than stored reserves, which are measured by ferritin. This blood test is commonly used alongside other markers to evaluate iron metabolism, diagnose anemia, and assess chronic diseases. Abnormal serum iron levels can indicate issues with absorption, utilization, or storage, and are interpreted together with transferrin and TIBC for accurate diagnosis.

Reference ranges

Group	Normal range	Unit
Men	65 – 175	µg/dL
Women	50 – 170	µg/dL
Children	50 – 120	µg/dL
Pregnant	30 – 120	µg/dL

Causes of abnormal values

Causes of low Serum Iron

• Iron deficiency anemia — insufficient dietary intake reduces iron availability
• Chronic blood loss — ongoing bleeding depletes iron stores
• Malabsorption disorders — impaired intestinal uptake (e.g. celiac disease)
• Pregnancy — increased demand exceeds intake

Causes of high Serum Iron

• Hemochromatosis — genetic condition causing excessive iron absorption and accumulation
• Iron supplementation excess — high intake overwhelms normal regulation
• Hemolytic anemia — breakdown of red blood cells releases iron into blood
• Frequent blood transfusions — repeated iron input exceeds storage control
• Liver disease — damaged liver releases stored iron into circulation
• Vitamin B12 or folate deficiency — impaired red blood cell production leaves iron unused

Serum Iron in combination with other markers

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Low Serum Iron + High TIBC Iron deficiency anemia with increased iron-binding capacity.

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High Serum Iron + High Ferritin Iron overload or hemochromatosis.

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Low Serum Iron + Low TIBC Anemia of chronic disease with impaired iron mobilization.

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High Serum Iron + Normal Ferritin Recent iron intake or supplementation effect.

Possible symptoms

•Fatigue and weakness
•Pale skin
•Shortness of breath
•Joint pain
•Abdominal discomfort

When to see a doctor

Consult a doctor if serum iron falls below 40 µg/dL or rises above 200 µg/dL, especially with symptoms like fatigue, pallor, or joint pain. Medical evaluation is needed for persistent abnormalities or repeated abnormal test results.

What to do if abnormal

🩺 Consult a doctor for evaluation
🔬 Request full iron panel (ferritin, TIBC, transferrin saturation)
💊 Review supplements and adjust iron intake
🥗 Improve diet with iron-rich foods and vitamin C
🔄 Monitor levels with repeat blood tests

The information on this page is intended for general understanding of test results and does not replace medical consultation. Accurate interpretation requires considering other blood markers and individual factors.

Content is based on medical literature and used within the PulseBook analytical system.

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Frequently asked questions

What does serum iron indicate?

Serum iron indicates the amount of circulating iron available in the blood for use in processes like hemoglobin production. It reflects iron transport rather than storage. This level helps assess iron balance and is important in diagnosing conditions such as anemia or iron overload when combined with other markers.

Is serum iron 40 µg/dL low?

Yes, a serum iron level of 40 µg/dL is considered low, especially for adults. It suggests reduced circulating iron and often indicates iron deficiency. This level may lead to symptoms like fatigue and weakness and usually requires further evaluation of iron stores and dietary intake.

What causes high serum iron levels?

High serum iron levels are caused by conditions like hemochromatosis, excessive iron supplementation, liver disease, or frequent blood transfusions. These factors increase iron accumulation or release into the bloodstream, raising levels beyond normal and potentially leading to organ damage if untreated.

Is high serum iron dangerous?

Persistently high serum iron is dangerous because excess iron accumulates in organs such as the liver and heart. This leads to long-term damage and complications. Identifying the cause and managing iron levels is important to reduce health risks.

What symptoms occur with low serum iron?

Low serum iron commonly causes fatigue, weakness, pale skin, and shortness of breath due to reduced hemoglobin production. These symptoms reflect decreased oxygen delivery in the body. Persistent low levels require investigation to identify underlying causes like blood loss or poor absorption.

How do you reduce high serum iron levels?

Reducing high serum iron depends on the cause. Common approaches include stopping iron supplements, adjusting diet, and medical treatments such as phlebotomy or chelation therapy. Monitoring iron levels regularly helps prevent complications and ensures effective management.