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Choose collection locationBiochemistry · Individual laboratory test
Serum iron measures iron circulating in the blood at the moment of the draw. It gives different information from the body's stored iron.
Clinical authorDr Nirupama SabhapathySpecialist Clinical Pathology
Understanding the test
Also called Serum Iron
Serum iron may be requested during an assessment of anaemia, iron treatment or possible iron overload. It is often paired with markers of storage and transport.
Circulating iron contributes to calculation of transferrin saturation.
The combination with ferritin can clarify whether low circulating iron reflects low stores or inflammatory changes.
Before your sample
Choose a fasting morning draw if possible. Meals and recent iron doses can change this circulating measurement; ask the clinician how to time an iron supplement.
A clinician takes a small sample of blood from a vein. The laboratory uses serum, the liquid separated from the blood after it clots.
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24 hoursLaboratory turnaround
The value varies through the day and after food or supplements. Ferritin and transferrin saturation help distinguish transient variation from a change in iron status.
From sample to follow-up

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Choose collection locationLook for Iron in your report. Use the sample type and collection time when comparing it with an earlier report.
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Note the collection time, last meal and last iron supplement, then compare the result with ferritin or binding capacity if available.
Health packages
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A recent dose or meal can change circulating iron. Give the team the time of your most recent dose and follow its instructions for your particular order.
Serum iron varies during the day, so a similar morning collection time makes two results easier to compare. A meal or a recent iron supplement can still affect the measurement. Tell the team when you last ate or took iron.
Most often it follows an iron tablet, multivitamin or infusion taken shortly before the sample. Less commonly it points towards iron overload, such as hereditary haemochromatosis or repeated blood transfusions, or reflects liver injury or red cell breakdown releasing iron into the blood. A repeat fasting morning sample with ferritin and transferrin saturation helps tell these apart.
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Written by Dr Nirupama Sabhapathy, Specialist Clinical Pathology. Medically reviewed by Dr Joyce Jose, Specialist Clinical Pathology, on .
Catalogue information and AED price checked on 2 November 2026. Clinical suitability, preparation, collection arrangements and turnaround are confirmed for your selected test.