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Minerals

Serum Iron: Normal Values and What a Low Iron Means

Serum iron reflects your current iron availability, which can be affected by menstruation, pregnancy, and hormonal changes. Regular monitoring helps maintain energy and well-being.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Your reference range
umol/l
6 35 umol/l
Reference ranges by group, in umol/l
Female · 6–12 years 7–31 umol/l
7 31
Female · 13–18 years 6–35 umol/l
6 35
Female · 19–50 years 7–35 umol/l
7 35
Female · 51–65 years 8–30 umol/l
8 30
Female · 66–80 years 8–30 umol/l
8 30
Female · 81 years and older 7–28 umol/l
7 28
6 35 umol/l

Source: NVKC Reference population: Nederlandse huisartsenpopulatie (NUMBER, n=7.574.327)

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

Iron (Serum): what this test measures

This test measures the amount of iron bound to transferrin in your blood at the time of testing. It reflects your current iron availability rather than long-term stores.

Iron (Serum): why this value matters

Iron is vital for producing red blood cells and carrying oxygen. Both low and high levels can affect your health. Serum iron is best interpreted alongside ferritin and TIBC for a complete picture. Consult your healthcare provider.

Iron (Serum): how to prepare

  1. Better not right after an infection

    Recommended

    After an infection or vaccination this value can be off for 2 weeks. Preferably draw once you are fully recovered.

  2. Preferably fasting

    Recommended

    Coming fasting gives a slightly cleaner value, but it is not required. If it suits you, eat nothing from 22:00 the evening before and drink only water.

  3. Preferably in the morning

    Recommended

    A morning draw makes this value easiest to compare with its reference range. Plan the draw before 10:00 if you can.

  • Water is always fine. Drink as usual beforehand, it makes the draw easier.
  • Take your usual medication, unless your own doctor told you otherwise.

Iron (Serum): when is testing worthwhile?

Testing may be recommended if you experience fatigue, weakness, or shortness of breath. It is often part of an iron studies panel when evaluating anaemia or iron metabolism disorders.

Iron (Serum): symptoms of a high or low value

Low Levels

Low serum iron may be associated with fatigue, pale skin, weakness, dizziness, cold hands and feet, and difficulty concentrating.

High Levels

High serum iron may be associated with joint pain, fatigue, abdominal pain, and skin changes. Chronically elevated iron can damage organs and requires medical evaluation.

Iron (Serum): what to do about an abnormal value

Female

If Low

Low iron is common in women due to menstruation. Consider iron supplementation (25-50 mg daily) with vitamin C for better absorption.

If High

High iron may indicate hemochromatosis or excessive supplementation. Consider genetic testing and reduce iron supplement intake.

Iron (Serum): lifestyle and this value

Eat a balanced diet with iron-rich foods. Pair plant-based iron with vitamin C for better absorption. Avoid excessive iron supplementation without medical guidance, as too much iron can be harmful.

Iron (Serum): frequently asked questions

Why does serum iron fluctuate?

Serum iron levels can vary throughout the day, with meals, and due to recent iron intake. For the most accurate results, testing is typically done in the morning while fasting.

What is the difference between serum iron and ferritin?

Serum iron reflects current circulating iron, while ferritin indicates stored iron. Together, they give a more complete picture of your iron status.

Can diet alone correct low iron?

Mild deficiencies may improve with dietary changes, but significant deficiencies may require supplementation. Always consult your healthcare provider for appropriate guidance.

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Iron (Serum)

€10,-