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Intel Lab Diagnostics Dubai
Single Biomarker

Iron

Serum Iron

Serum iron measures the amount of circulating iron in your blood. Low levels suggest iron deficiency, while high levels may indicate iron overload. Best tested in the morning after fasting.

BLOOD24 HOURSFASTING
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  • Free home collection
  • Physician-reviewed report

24 Hours

Turnaround

Blood

Sample

About This Test

What the Iron test tells you

Serum iron measures the iron that is bound to transferrin and circulating in your blood at the moment the sample is taken. That transport pool is a tiny fraction of the iron in your body: most of it sits inside haemoglobin in red cells, and much of the rest is locked away in ferritin in the liver, spleen and bone marrow. Serum iron therefore describes traffic rather than reserves, which is both what makes it informative and what makes it easy to misread.

The value moves a great deal. It follows a daily rhythm, running higher in the morning and drifting down through the day. A meal changes it, and an iron tablet or an infusion can raise it sharply for hours, so a sample taken soon after a dose describes the dose rather than the person. Inflammation pushes it down within a day through the hormone hepcidin, which withdraws iron from circulation as a defence against infection. Because of all this, serum iron is almost never interpreted alone; it is combined with total iron binding capacity to calculate transferrin saturation, and read alongside ferritin and the blood count.

It is the pattern that carries the meaning. Low circulating iron with a raised binding capacity and a low ferritin fits true iron deficiency. Low circulating iron with a normal or reduced binding capacity and a normal or high ferritin fits the anaemia of chronic disease, where iron exists but is being held back. High circulating iron with a high saturation raises the possibility of iron overload or simply of recent supplementation. Standardising the conditions of the sample, by attending fasting in the morning and pausing supplements as advised, is what makes any of these patterns readable.

Sample type
Blood
Measured in
µg/dL
Turnaround
24 Hours
Fasting
Required
Best for
Adults & teens
Why Get Tested?

Used alongside other iron studies to diagnose iron deficiency anaemia, iron overload (haemochromatosis), and to monitor iron supplementation therapy.

  • Completing iron studies

    Serum iron is one of the values used to calculate transferrin saturation, which cannot be worked out without it.

  • Separating deficiency from inflammation

    Combined with binding capacity and ferritin, it helps distinguish a true lack of iron from iron that is present but withheld during chronic illness.

  • Investigating possible overload

    A high circulating iron with high saturation is one of the first signals that prompts a search for haemochromatosis or transfusional overload.

  • Checking treatment effect

    It shows whether oral iron is being absorbed, which is useful when a course of supplements is not producing the expected response.

When This Test Is Ordered

Reasons your doctor may request the Iron test

Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.

  • Anaemia & iron deficiency

    • Suspected iron deficiency, measured together with ferritin and binding capacity.
    • Investigation of anaemia found on a blood count.
    • Distinguishing iron deficiency from the anaemia that accompanies chronic disease.

  • Iron overload

    • Suspected iron overload, or a family history of haemochromatosis.
    • Assessment after repeated blood transfusions.

  • Iron treatment

    • Monitoring oral iron treatment or assessing whether it is being absorbed.
Preparation
The short version
A little prep.
  • Blood
  • Free home collection
  • Fasting required
  • Results in 24 Hours
  1. 1
    Book any time

    Pick a morning slot online or on WhatsApp: come fasted per the prep note below.

  2. 2
    We come to you

    A DHA-licensed nurse collects your sample at home or in the office: free home collection.

  3. 3
    Results in 24 Hours

    A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.

Prep note
Physician reviewed

Attend in the morning after an overnight fast, with plain water allowed and encouraged.

Timing genuinely matters for this test: circulating iron is highest early in the day and falls as the day goes on, so a morning sample makes your result comparable with previous and future ones. Do not take iron tablets, multivitamins containing iron or fortified supplement drinks on the morning of the test, and ask your doctor whether to pause them for some days beforehand, because a recent dose can raise the result sharply and hide a deficiency.

Tell the team about any intravenous iron infusion or blood transfusion, about pregnancy, and about any infection or illness in recent weeks, since inflammation lowers circulating iron. Keep repeat samples at the same time of day.

Understanding Your Results

Serum iron, reported in µg/dL, describes the iron in transit on transferrin at the moment of the draw, not your stores. A result in the Normal band is best read with total iron binding capacity, transferrin saturation, ferritin and the blood count, because it is the pattern that carries the meaning. A Low result fits true iron deficiency when binding capacity is raised and ferritin is low; with a normal or high ferritin it more often reflects inflammation or infection, which withdraws iron from the circulation without emptying stores. Pregnancy, malabsorption, chronic kidney disease and simply attending later in the day all lower it. A High result may point to iron overload, but far more often follows an iron tablet, multivitamin or infusion taken shortly beforehand; liver injury and red cell breakdown raise it too. Your doctor interprets it alongside your symptoms and history.

SmartReport
60170
Healthy zone115µg/dLNormal
Reference ranges · µg/dL
Low
Low circulating iron: may indicate deficiency.
20–59
Normal
Normal circulating iron.
60–170
High
Elevated: may relate to iron overload.
171–300

Ranges are a guide: your physician interprets your result alongside your symptoms and history.

Reading a High or Low Result

  • What a higher result can point to

    • An iron tablet, multivitamin or intravenous iron given shortly before the sample.
    • Hereditary haemochromatosis, in which iron absorption is inappropriately high.
    • Repeated blood transfusions, which deliver iron the body cannot excrete.
    • Liver disease or liver cell injury, which releases stored iron into the blood.
    • Haemolysis, where red cells break down and release their iron into the circulation.

  • What a lower result can point to

    • Genuine iron deficiency from blood loss or inadequate intake.
    • Inflammation or infection, which withdraws iron from circulation through hepcidin without depleting stores.
    • A sample taken later in the day, since circulating iron falls naturally from morning to evening.
    • Pregnancy, where demand rises and circulating iron is drawn down.
    • Malabsorption from coeliac disease, gastric surgery or long-standing gastritis.
    • Chronic kidney disease, which disturbs both iron handling and red cell production.

These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.

Limitations & Safety

What this test cannot tell you

  • The value varies markedly within a single day and after meals or supplements, so an isolated result can be misleading.
  • It measures iron in transit rather than iron in storage, so it cannot confirm or exclude depleted reserves on its own.
  • Inflammation lowers it independently of iron stores, which means a low result does not by itself establish iron deficiency.

Risks of the blood draw

  • Mild bruising or brief soreness where the needle went in.
  • Occasional lightheadedness, which settles after a few minutes of rest.
  • Bleeding or infection at the site, which is rare with sterile single-use equipment.
Key Points
  • 1Serum iron reflects the iron circulating on transferrin, not your iron stores.
  • 2Levels are naturally highest in the morning and fall through the day.
  • 3A recent iron tablet or infusion can raise the result dramatically and briefly.
  • 4It is interpreted through transferrin saturation and alongside ferritin, never alone.
  • 5Inflammation lowers circulating iron as a normal defensive response, not because stores are empty.
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Frequently Asked Questions

Everything you need to know about the Iron test. Can't find what you're looking for?

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Circulating iron follows a daily rhythm, sitting highest in the early hours of the day and falling towards evening. Sampling at a consistent morning time removes that variation so changes between tests reflect you rather than the clock.