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Serum Iron Blood Test: What Your Results Mean

Serum iron measures the amount of iron currently circulating in your blood. It is typically tested alongside ferritin, transferrin, and TIBC to get a complete picture of iron status. Serum iron fluctuates significantly throughout the day and is influenced by recent meals.

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Normal Range

60 – 170 µg/dL

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Unit

µg/dL

What Your Results Mean

Normal

Normal serum iron indicates adequate iron availability for red blood cell production and cellular function.

High

High serum iron can indicate iron overload (hemochromatosis), liver disease, or excessive supplementation. It can damage organs if left untreated.

Low

Low serum iron indicates iron deficiency, often from poor dietary intake, blood loss, or poor absorption. It leads to reduced hemoglobin production and eventually anemia.

Frequently Asked Questions

What is the difference between serum iron and ferritin? expand_more

Serum iron measures iron currently in the blood. Ferritin measures iron stores. Ferritin is a better indicator of total body iron status as serum iron fluctuates with meals and time of day.

Should I fast before an iron test? expand_more

Yes — fasting for 8–12 hours and testing in the morning gives the most accurate serum iron results, as iron levels peak in the morning and are affected by recent meals.

What causes low serum iron? expand_more

Iron deficiency from inadequate diet, heavy periods, gastrointestinal bleeding, pregnancy, malabsorption (celiac disease), and chronic inflammation are the most common causes.

What is TIBC and how does it relate to iron? expand_more

TIBC (Total Iron Binding Capacity) measures how well transferrin can carry iron. High TIBC with low serum iron confirms iron deficiency. Low TIBC with high serum iron suggests iron overload.

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