Medically reviewed by Dr. Hafiz Muhammad Haseeb, M.B.B.S., F.C.P.S. (Haematology), Consultant Haematologist, Al-Nasar Lab & Diagnostic Centre. Updated September 2026.
Quick answer: Iron studies measure how much iron is in your blood and how much is stored in your body. Ferritin is the most important value, because it reflects your iron stores and falls before haemoglobin does. A ferritin below about 30 ng/mL indicates iron deficiency, even if your haemoglobin still looks normal.
Book iron studies: call 0300 0341944, or arrange home sample collection across Lahore on 0309 1166944.
What do iron studies actually measure?
| Test | What it shows | Typical adult range |
|---|---|---|
| Ferritin | Iron stored in the body. The earliest and most sensitive marker | roughly 30 to 300 ng/mL in men, 15 to 200 in women |
| Serum iron | Iron circulating in the blood right now. Fluctuates through the day | roughly 60 to 170 mcg/dL |
| TIBC | How much capacity your blood has to carry iron. Rises when iron is short | roughly 240 to 450 mcg/dL |
| Transferrin saturation | What percentage of that carrying capacity is filled | roughly 20 to 50 percent |
| Haemoglobin (from CBC) | Whether anaemia has already developed | 13.5 to 17.5 g/dL men, 12.0 to 15.5 women |
Ranges vary between laboratories. Read the range printed on your own report.
Why does ferritin matter more than haemoglobin?
This is the single most useful thing to understand about iron testing.
Your body protects haemoglobin. When iron intake falls short, it does not immediately reduce your blood count. It draws on stored iron first, quietly depleting the reserve while the haemoglobin stays normal. Only once the stores are exhausted does anaemia appear.
This means a person can feel exhausted for months, be told their haemoglobin is fine, and still be genuinely iron deficient. Ferritin catches that stage. A complete blood count alone does not.
One important catch with ferritin
Ferritin rises during any infection or inflammation, regardless of iron status. So someone who is both iron deficient and unwell can show a misleadingly normal ferritin.
This is why iron studies are interpreted as a set rather than a single number. In genuine iron deficiency the pattern is characteristic: ferritin low, serum iron low, TIBC high, transferrin saturation low. Your doctor may also check CRP to see whether inflammation is distorting the picture.
What causes iron deficiency in Pakistan?
- Diet. Iron from plant sources is absorbed far less efficiently than iron from meat, and tea with meals reduces absorption further, which matters given how commonly tea accompanies food here
- Menstrual blood loss. The most common cause in women of reproductive age, especially with heavy periods
- Pregnancy. Requirements rise substantially and deficiency is very common
- Children and adolescents during growth spurts
- Intestinal blood loss from ulcers, haemorrhoids or, in older adults, more serious causes
- Intestinal parasites, still a meaningful cause in parts of Pakistan
- Coeliac disease and other absorption disorders
The point most people miss
Iron deficiency is a symptom, not a diagnosis. The important question is always why the iron is low.
In a young woman with heavy periods, the answer is usually obvious and treatment is straightforward. In a man of any age, or a woman past menopause, unexplained iron deficiency needs investigation, because slow blood loss from the digestive tract is a recognised cause and can be the first sign of something that needs finding early.
Taking iron tablets without asking that question can correct the blood count while leaving the underlying cause unaddressed.
Who should be tested?
- Persistent tiredness, weakness or breathlessness on mild exertion
- Pale skin, brittle nails, hair fall
- Unusual cravings for ice, clay or chalk, which is a recognised sign of iron deficiency
- Restless legs at night
- Women with heavy or prolonged periods
- All pregnant women, as part of routine antenatal testing
- Anyone with a low haemoglobin or a low MCV on a blood count
- Vegetarians and people eating little meat
- Before planned surgery
How to prepare
- A morning sample is preferred, since serum iron varies through the day and is highest in the morning
- Stop iron supplements 24 to 48 hours beforehand unless your doctor says otherwise, as recent tablets raise serum iron and distort the result
- Fasting is often advised, particularly if the test is combined with other blood work
- Tell the laboratory about any recent infection or fever, since inflammation affects ferritin
Iron and anaemia testing at Al-Nasar Lab
Al-Nasar Lab & Diagnostic Centre has provided laboratory testing in Lahore since 1996 and holds ISO 15189:2022 accreditation from the Pakistan National Accreditation Council. Ferritin, serum iron, TIBC, transferrin saturation, complete blood count and vitamin B12 testing are all available, with home sample collection across Lahore and same day digital reports.
Because tiredness has several possible causes, iron studies are often taken alongside thyroid function, B12 and vitamin D from one sample during a single visit.
Find your nearest collection centre, see our full test list, or contact us to book.
Frequently Asked Questions
What is a normal ferritin level?
Roughly 30 to 300 ng/mL in men and 15 to 200 in women. Below about 30 indicates iron deficiency, and many doctors treat below 50 when symptoms are present.
Can I be iron deficient with normal haemoglobin?
Yes, and it is common. Stored iron depletes first while haemoglobin stays normal, which is why ferritin is the more sensitive test.
Should I stop iron tablets before the test?
Generally yes, 24 to 48 hours beforehand, unless your doctor advises otherwise. Recent supplements raise serum iron and can mask a deficiency.
Why is my ferritin normal when I feel exhausted?
Ferritin rises with infection or inflammation and can appear falsely normal. Your doctor interprets it alongside serum iron, TIBC and saturation rather than in isolation.
How long does it take to correct iron deficiency?
Blood counts usually improve within a few weeks of treatment, but replenishing stored iron takes several months, which is why treatment continues after the haemoglobin normalises.
This article is for general information and is not a substitute for medical advice. Please discuss your results with a qualified doctor.
