Blood Test

Iron Studies (Iron Test): Serum Iron, TIBC, Transferrin Saturation

Name: Iron Test (Iron Studies): Normal Range, Serum Iron & TIBC | HealthReview
Creator: Suman Konda
Published: 2026-07-05

Iron studies give a complete picture of your body's iron status: going beyond a simple haemoglobin level to show exactly where in the iron pathway the problem lies.¹

Written by Suman Konda, Clinical Pharmacist · Based on peer-reviewed sources · Editorial policy · Not medical advice

Last reviewed and updated: 26 September 2026 · How we check our content

Quick answer

Iron studies are a panel: serum iron (men 65-175, women 50-170 micrograms/dL), TIBC (250-370), transferrin saturation (20-50%) and ferritin. Classic iron deficiency shows low iron, high TIBC, saturation below 16% and low ferritin. Low iron with low TIBC and normal ferritin means anaemia of chronic disease. Saturation above 45% should prompt a check for iron overload.

What are Iron Studies?

Iron studies are a panel of blood tests that measure different aspects of how your body handles iron. The panel typically includes: Serum Iron (iron in the blood right now), TIBC (Total Iron Binding Capacity, the maximum amount of iron your blood can carry), Transferrin Saturation (% of TIBC that is actually carrying iron), and often Ferritin (iron stores). Together, these tests tell your doctor whether you have iron deficiency, iron overload, or anaemia of chronic disease.

Scroll sideways to see the whole diagram

Iron study patterns and what each combination suggests.

What the table shows. Iron deficiency gives low iron, low ferritin, high TIBC and low transferrin saturation. Anaemia of inflammation looks similar on serum iron but ferritin is normal or high and TIBC is low, because ferritin is an acute-phase protein. The difficult case is the third row, iron deficiency occurring alongside inflammation, where ferritin can sit in the normal range while iron stores are genuinely depleted. That is why ferritin is interpreted next to CRP rather than alone.

Iron Studies Normal Range

Test	Normal Range (Adults)
Serum Iron: Men	65 – 175 µg/dL
Serum Iron: Women	50 – 170 µg/dL
TIBC	250 – 370 µg/dL
Transferrin Saturation	20 – 50%
Ferritin: Men	24 – 336 ng/mL
Ferritin: Women	11 – 307 ng/mL

Key points

Iron studies are a panel: serum iron, TIBC, transferrin saturation and ferritin, together showing where in the iron pathway the problem lies.
Classic iron deficiency: low serum iron, high TIBC, transferrin saturation below 16%, and low ferritin.
Anaemia of chronic disease: low serum iron with low TIBC and normal or high ferritin; iron is trapped in cells by inflammation, and treating the underlying condition is the answer, not iron supplements.
Iron overload: high serum iron, low TIBC, transferrin saturation above 45-60%, and very high ferritin, as in hereditary haemochromatosis.
Transferrin saturation above 45% in an otherwise healthy person should prompt a ferritin check and possible HFE gene testing.
Serum iron fluctuates day to day, so the pattern across the panel matters more than any single value.

Iron Deficiency Pattern

LOW Iron deficiency anaemia pattern

Low serum iron + High TIBC + Low transferrin saturation (below 16%) + Low ferritin = Classic iron deficiency anaemia. Your body is starving for iron. TIBC is high because your blood is producing extra "carriers" desperately trying to grab any available iron. This pattern is the most common cause of anaemia worldwide, especially in women and children.

Anaemia of Chronic Disease Pattern

Anaemia of chronic disease (ACD) pattern

Low serum iron + Low TIBC + Low/Normal transferrin saturation + Normal or HIGH ferritin = Anaemia of chronic disease. This occurs in chronic infections (TB, HIV), autoimmune diseases, kidney disease and cancer. Iron is trapped inside cells and cannot be used, even though stores are adequate. Treating the underlying condition (not giving iron supplements) is the right approach here. The iron restriction seen in ACD is itself a host defence mechanism: inflammatory cytokines raise hepcidin, which blocks iron release from stores and absorption from the gut, partly to limit the iron available to invading bacteria. Giving iron supplements in ACD is usually unhelpful for the anaemia and, particularly with intravenous iron during active infection, has been linked to a theoretical risk of promoting bacterial growth.³

Iron Overload Pattern

HIGH Iron overload (haemochromatosis) pattern

High serum iron + Low TIBC + High transferrin saturation (above 60%) + Very high ferritin = Iron overload. In hereditary haemochromatosis, the body absorbs too much iron and deposits it in organs (liver, heart, joints, pancreas). Treatment is regular blood donation (phlebotomy) to reduce iron. Very high transferrin saturation (above 45%) in otherwise healthy person should prompt a ferritin test and possibly genetic testing for HFE gene mutation: the AASLD's hemochromatosis practice guideline chose this 45% cutoff specifically because it is highly sensitive for detecting the C282Y homozygotes who cause most hereditary haemochromatosis, at the cost of triggering some unnecessary follow-up testing.²

Questions to ask your doctor

Is this iron deficiency anaemia or anaemia of chronic disease?
What is the underlying cause of my iron deficiency: diet, periods or gut bleeding?
Do I need IV iron or are tablets sufficient?
When should I recheck iron studies after starting treatment?

Ferritin vs serum iron vs TIBC vs transferrin saturation vs haemoglobin: how they compare

Iron studies is a panel because no single iron test tells the truth alone. Each answers a different question:

Test	What it measures	When it is ordered	Key limitation
Ferritin	Iron in storage	First-line for deficiency or overload	Rises with inflammation — hides deficiency during illness
Serum iron	Iron in transit	Part of the panel	Swings through the day — morning fasting samples are standard
TIBC	Total iron-binding capacity (transferrin)	Part of the panel	Rises in deficiency, falls in inflammation — read inversely
Transferrin saturation	How full the transport protein is	Sorting deficiency from overload	Calculated from iron and TIBC — inherits both flaws
Haemoglobin	Red-cell oxygen carrier	Detecting anaemia itself	Falls late — stores empty months before anaemia shows

The classic deficiency pattern is low ferritin, low serum iron, high TIBC and low saturation — read the pattern, not any single line.

Reading your report: what your doctor actually looks at

When a doctor opens iron studies, the pattern across the panel is the diagnosis. Here is the checklist they run through — and the same checklist helps you read your own report calmly:

Was it morning and fasting? Serum iron has a diurnal rhythm — afternoon values run lower. A non-fasting afternoon sample can fake deficiency; timing is part of the result.
Were you inflamed? Ferritin rises and serum iron falls with inflammation — the panel during illness points everywhere and nowhere. CRP alongside helps.
Does the pattern fit? Deficiency, overload and anaemia of chronic disease each have a signature across the four markers — a mixed pattern needs sorting, not supplementing.
Can ferritin be normal in deficiency? Yes — early deficiency, or deficiency masked by inflammation. The saturation and the story arbitrate.
Where is the iron going? Deficiency with no cause found prompts the search for blood loss — heavy periods, gut loss. Replacing iron without finding the leak misses the point. Discuss the full picture with your doctor.

Iron studies is a pattern test: the four markers plus timing plus inflammation tell one story. A single flagged line is the start of interpretation, not the end. Discuss the full picture with your doctor.

Iron studies test price in India: typical bands across major lab chains

Iron studies are usually ordered as a panel rather than as single tests, which is better value. Typical list-price bands for the panel:

Lab chain	Typical price band	Notes
Dr Lal PathLabs	Typically &rupee;900–&rupee;1,500	Wide network; online booking often slightly cheaper
Metropolis Healthcare	Typically &rupee;800–&rupee;1,400	Frequent online discounts
Thyrocare (via partner labs)	Typically &rupee;800–&rupee;1,200	Often the lowest list price; home collection available
Apollo 24\|7	Typically &rupee;850–&rupee;1,400	Integrated with Apollo hospitals
Orange Health	Typically &rupee;900–&rupee;1,500	Home-collection focused in metro cities

These are approximate bands, not quotes: prices change often and vary by city, and home collection can add a small fee. Because it is a specialised test, smaller centres may send the sample to a reference laboratory, which can add a day to the result. Where possible, choose a NABL-accredited lab.

Frequently Asked Questions

Does the trend matter more than one Iron Studies reading?

For long-term monitoring it generally does. A figure that has drifted across several tests says more than a single measurement, and a stable result sitting slightly outside the range is often simply that person's baseline.

Do Iron Studies results from two different laboratories compare directly?

Not reliably. Transferrin saturation is calculated from iron and TIBC, and labs use different TIBC methods, so the calculated percentage can shift between laboratories even when true iron status is unchanged. Where Iron Studies is being tracked over time, staying with one laboratory makes the comparison meaningful.

Why did my Iron Studies change when nothing else did?

Biological variation is real. Hydration, time of day, recent food, exercise and a recent infection all move Iron Studies to some degree, and every assay carries its own small imprecision on top of that.

How much does the Iron studies test cost in India?

There is no single fixed price — it varies by city, lab, and whether the test is ordered alone or as part of a panel. NABL-accredited labs usually publish their rates online, so it is worth comparing a couple near you. Whatever you pay, the reference range printed on your own report is what counts — discuss the result with your doctor.

Can I be iron deficient even if my ferritin is normal?

Yes. Ferritin rises with infection or inflammation, which can mask deficiency — the protein goes up because you are unwell, not because your iron stores are fine. That is why doctors read ferritin together with transferrin saturation and the rest of the panel, and ask about recent illness.

How soon are iron studies repeated after starting treatment?

Usually after about 8–12 weeks, not days — iron stores rebuild slowly. Your doctor decides the timing; testing too early mostly shows noise rather than progress.

Do I need to fast for iron studies?

Most labs ask for a morning fasting sample, because serum iron varies through the day and is highest in the morning. Testing under the same conditions each time keeps trends comparable.

My iron studies are normal but I am still tired — why?

Fatigue has many possible causes and iron is only one of them: thyroid issues, vitamin B12 or D deficiency, poor sleep, and stress are common alternatives. Normal iron studies usefully rule one cause out — discuss the next steps with your doctor.

Pharmacist's practical notes

Timing is the panel's hidden variable: serum iron's diurnal swing means a morning fasting sample is the standard, and comparing an afternoon value against a morning reference misleads. If your draw was afternoon and non-fasting, say so — the interpretation changes.

Don't start iron before testing: supplementation normalises serum iron quickly while stores lag, producing a confusing half-treated panel. Test first, then treat. And iron absorption is blocked by several common medicines and by tea/coffee taken together — ask your pharmacist about spacing once treatment starts.

In India

Indian labs report ferritin in ng/mL (equivalent to µg/L), and serum iron and TIBC in µg/dL. The panel typically costs &rupee;800–&rupee;1,500, though prices vary by city and lab.

Where possible, choose a NABL-accredited lab. Reference ranges differ slightly between analysers — the range on your own report rules.

References

Sources cited on this page. PubMed links open the original abstract.

Brugnara C. Iron deficiency and erythropoiesis: new diagnostic approaches. Clin Chem. 2003;49(10):1573–1578. PMID 14500582 · doi:10.1373/49.10.1573
Bacon BR, Adams PC, Kowdley KV, Powell LW, Tavill AS. Diagnosis and management of hemochromatosis: 2011 practice guideline by the American Association for the Study of Liver Diseases. Hepatology. 2011;54(1):328–343. PMID 21452290 · doi:10.1002/hep.24330
Weiss G, Goodnough LT. Anemia of Chronic Disease. N Engl J Med. 2005;352(10):1011–1023. PMID 15758012 · doi:10.1056/NEJMra041809

Medical Disclaimer: This page is for general educational purposes only and does not constitute medical advice. Always consult a qualified doctor before making any health decisions.