Iron Test: Purpose, Normal Range and Price

The Serum Iron test is a blood test that measures the amount of iron circulating in the bloodstream bound to transferrin, the primary iron transport protein. Iron is an essential mineral required for the production of hemoglobin in red blood cells, myoglobin in muscle tissue, and numerous enzymes involved in energy metabolism and immune function. The serum iron test reflects the iron available for immediate use in the body and is most clinically meaningful when interpreted alongside TIBC, transferrin saturation, and ferritin as part of a complete iron studies panel. Iron deficiency is the most prevalent nutritional deficiency in India, affecting an estimated 50 to 70% of women of reproductive age, over 67% of children under five, and a significant proportion of adolescents and elderly individuals. Despite its extraordinary prevalence, iron deficiency is frequently underdiagnosed because serum iron alone can fluctuate significantly throughout the day and is influenced by recent meals, inflammation, and diurnal variation. The serum iron test is therefore most valuable not as a standalone test but as part of a comprehensive iron panel that accurately characterises the type and severity of iron disorder. The test involves a simple blood draw completed in under five minutes.

Doctors prescribe a Serum Iron test in the following situations: Diagnosing iron deficiency anaemia in patients with fatigue, weakness, pallor, and breathlessness where a low serum iron alongside low ferritin and elevated TIBC confirms depleted iron stores as the cause of anaemia. Investigating iron overload conditions including hereditary haemochromatosis where elevated serum iron alongside elevated transferrin saturation and ferritin confirms pathological iron accumulation in organs requiring urgent evaluation and treatment. Evaluating unexplained fatigue, hair loss, poor concentration, and reduced exercise tolerance in patients with normal hemoglobin where a low serum iron may reveal subclinical iron deficiency causing symptoms before anaemia has developed. Assessing iron status in pregnant women where iron requirements increase substantially and iron deficiency is associated with adverse maternal and foetal outcomes including preterm birth, low birth weight, and impaired neonatal neurological development. Monitoring iron replacement therapy in patients on oral or intravenous iron supplementation to assess whether iron levels are rising adequately and whether the chosen supplementation route and dose are effective. Investigating anaemia of chronic disease in patients with chronic kidney disease, rheumatoid arthritis, inflammatory bowel disease, and malignancy where serum iron is typically low but ferritin is normal or elevated, distinguishing it from true iron deficiency. Evaluating patients with suspected iron poisoning or accidental iron overdose, particularly in children, where very high serum iron levels confirm toxicity requiring emergency management.

The Serum Iron test measures the concentration of iron bound to transferrin in the blood, reported in micrograms per decilitre (mcg/dL) or micromoles per litre (umol/L). Normal Serum Iron Range in India The standard reference ranges used across most Indian diagnostic laboratories are as follows. For adult men, a normal serum iron level is between 60 and 170 mcg/dL. For adult women, a normal serum iron level is between 50 and 150 mcg/dL. Serum iron levels fluctuate significantly throughout the day, being highest in the morning and lowest in the evening, which is why morning fasting samples are recommended for the most consistent and comparable results. Interpreting Serum Iron Results A serum iron below the normal range alongside low ferritin and elevated TIBC confirms iron deficiency, with the combination of all three parameters providing the most accurate and complete picture of the iron deficiency state. A serum iron below normal with a normal or elevated ferritin and low TIBC is the characteristic pattern of anaemia of chronic disease, where iron is sequestered within cells by inflammatory cytokines and is unavailable for red blood cell production despite adequate total body iron stores. A serum iron above 170 mcg/dL in men or 150 mcg/dL in women is elevated and when accompanied by a transferrin saturation above 45% raises concern for iron overload, hereditary haemochromatosis, or excessive iron supplementation requiring further evaluation.

Fasting for 8 to 12 hours before the test is recommended and the sample should ideally be collected in the morning. Serum iron shows significant diurnal variation with highest levels in the morning and a fall of up to 30% by the afternoon, making morning fasting collection essential for accurate and reproducible results. Our team confirms preparation requirements at the time of booking. Do not take iron supplements for at least 24 to 48 hours before the test as recently ingested iron can transiently raise serum levels and mask a true deficiency state. Inform your doctor if you are currently on iron supplementation. Inform the phlebotomist about all medications you are currently taking, particularly iron supplements, vitamin C tablets, oral contraceptives, chloramphenicol, and deferoxamine, as these can directly affect serum iron levels and must be disclosed for accurate interpretation. Avoid recent blood transfusions before the test as transfused blood can transiently raise serum iron and will not accurately reflect your body's own iron stores. Stay normally hydrated before sample collection.

If you are booking through the SecondMedic platform the Iron test price starts at approximately Rs. 226. The exact price will be confirmed at the time of booking through SecondMedic. If your doctor has prescribed multiple tests alongside Iron, SecondMedic health packages include Iron as part of a broader iron studies, anaemia evaluation, or nutritional deficiency panel at a significantly lower combined price.

SecondMedic provides home sample collection for Iron test across all major areas in India. You do not need to visit a lab or collection centre. A certified and trained phlebotomist comes to your home or workplace at your chosen time, collects the sample using sterile single-use equipment, and ensures it is transported to the NABL-accredited lab within the required time window for accurate processing. Please note that SecondMedic provides free home sample collection on all tests priced above Rs. 300. Our team will check your pincode and confirm if your address falls under our free sample collection eligibility criteria, which depends upon the lab location and phlebotomist availability. Home collection is available between 7 AM and 10 PM, seven days a week, including Sundays and public holidays. Enter your pincode on the booking page or call our helpline to confirm availability at your address.