Serum iron is a direct blood measurement of the iron bound to transferrin in circulation at the moment of collection. Practitioners read it as one part of iron studies, alongside ferritin, transferrin and transferrin saturation. Time of day, recent iron supplements or fortified foods, and acute infection all shift it, so a single value should not change a plan on its own.
| Test type | Measured in a blood sample |
|---|---|
| Measurements required | Serum iron only |
| Sample and collection | Blood draw at a collection centre |
| Preparation | Book a morning collection and fast for 8 to 12 hours beforehand, water only. Iron changes through the day, so mornings give comparable results. |
| Turnaround | 3 to 5 business days |
| Available through | Iron Studies, part of the Baseline Health Check. Also in: Energy Panel, Weight Insight Panel. |
| Pricing | Included in the $99 Baseline Health Check |
| Results | Returned in the Vively practitioner platform, beside your client's other markers |
What are the Serum iron reference and optimal ranges?
| Typical lab reference | Vively optimal | |
|---|---|---|
| Adults | 10 to 30 µmol/L | No separate optimal range |
Labs differ, so read the result against the range printed on the client's report (RCPA guidance). The range describes a snapshot and is not used on its own to diagnose deficiency or overload.
Check a client's Serum iron result
Enter the value from your client's lab report to see where it sits against the typical lab range and the Vively optimal range.
A guide only, not a diagnosis. One result is a starting point: read it with symptoms, history and a repeat test. Labs differ, so check the result against the range on your client's report. Nothing you enter is stored or sent.
How do you arrange Serum iron testing through Vively?
- Get verified. Practitioners with a recognised qualification or membership (ATMS, NHAA, ANTA, Dietitians Australia, NSA, CMA or Ahpra registration) can request free practitioner access.
- Choose a panel. Log in to the practitioner platform and pick a panel that includes Serum iron, or build your own. It is included in the $99 Baseline Health Check.
- Client collects. Your client collects at a partner collection centre, with their request on their phone or printed.
- Review results. Results come back to you in the practitioner platform, beside your client's other markers, ready for the follow-up consult.
Which Vively panels include Serum iron?
Log in to the practitioner platform to view a panel in full, or build and save your own from 100+ tests and panels.
- Baseline Health Check74 markers across 11 lab groups$99
One fasting blood draw.
Full Blood CountUrea, Electrolytes & CreatinineLiver Function TestsCalcium, Phosphate & MagnesiumLipid StudiesDiabetes & Glycaemic StudiesIron StudiesThyroid Function Tests+3 moreLog in to view this panel - Log in to view this panelIron Studies5 markers · NutrientsPrice on sign-up
- Log in to view this panelEnergy Panel6 markers · NutrientsPrice on sign-up
How do you read Serum iron without an optimal range?
No separate optimal range: serum iron varies widely across a day and rises within hours of an iron-rich meal or supplement, so a target would chase noise.
RCPA guidance on iron studies advises against using serum iron alone to judge iron status.
In deficiency, low iron with high transferrin pulls saturation down. In overload or after a recent dose, high iron with normal transferrin pushes it up.
Inflammation lowers serum iron within a day or two, even when stores are full.
What should Serum iron be read with?
- LowLow iron, low ferritin, high transferrin
Iron deficiency; low transferrin saturation confirms reduced supply.
- LowLow iron, normal or high ferritin, low transferrin
Often seen with inflammation or chronic disease, where hepcidin holds iron in stores.
- HighHigh iron, high saturation, high ferritin
Possible iron overload; needs GP review.
- HighHigh iron, normal ferritin
Usually a recent supplement or iron-rich meal; repeat fasting after a 24-hour pause.
What can affect a Serum iron result?
- Oral iron supplements or iron-fortified foods in the previous 24 hours
- Time of day: higher in the morning than the afternoon
- Acute infection or inflammation lowers it within a day or two
- Menstruation and recent blood donation
- A recent iron infusion or blood transfusion
When should you refer the client to their GP?
- High serum iron with transferrin saturation of 45% or more on a repeat fasting sample
- Low iron with ferritin below 30 µg/L, especially with anaemia
- Low iron with anaemia and a raised hs-CRP, where the cause of the inflammation needs a diagnosis
How should a client prepare for a Serum iron test?
Copy or print this to send to your client.
Preparing for your Serum iron test
- Book a morning collection and fast for 8 to 12 hours beforehand, water only. Iron changes through the day, so mornings give comparable results.
- Pause any over-the-counter iron supplement for 24 hours before your test. If a doctor prescribed your iron, check with them first.
- Take your pathology request to any of 4,000+ collection centres. Bring it printed or on your phone.
- Keep taking prescribed medicines as usual unless your doctor tells you otherwise.
- Results usually take 3 to 5 business days and come to your practitioner. Book your results appointment for after that.
How do practitioners use Serum iron with clients?
Do not change a plan on serum iron alone. If a single high value looks out of place, check whether the client took iron that morning, then repeat fasting after a 24-hour pause before reading anything into it.
Serum iron FAQs
Can serum iron diagnose iron deficiency?
No. Serum iron is a snapshot that moves with meals, supplements, time of day and inflammation. Ferritin is the test for stores, and transferrin saturation shows how much iron is reaching the marrow. Serum iron matters mainly as the input to the saturation calculation, which is why it is reported inside iron studies rather than alone.
Why is serum iron low when ferritin is normal?
Inflammation is the usual reason. During infection or chronic inflammatory disease, hepcidin rises and traps iron in stores and gut cells, so serum iron and transferrin fall while ferritin stays normal or high. Check hs-CRP, and if the pattern persists once the client is well, discuss it with their GP.
Can a naturopath, nutritionist or dietitian order iron studies through Vively?
Yes. Add it to a client panel on the Vively practitioner platform. It is part of Iron Studies in the $99 Baseline Health Check, and is also in Energy Panel and Weight Insight Panel. No account yet? Request free access.
Why does serum iron vary so much between tests?
Serum iron measures iron in circulation at one moment, so it moves with time of day (higher in the morning), recent meals and any iron taken in the previous 24 hours. Infection, menstruation and recent blood donation also shift it. This is why a single value should not change a plan without ferritin and transferrin saturation beside it.
How do I read serum iron with ferritin and transferrin?
Low iron with low ferritin and high transferrin is iron deficiency. Low iron with normal or high ferritin and low transferrin often points to inflammation, where hepcidin holds iron in stores, so check hs-CRP. High iron with high saturation and high ferritin is possible overload and needs GP review.
References
- Royal College of Pathologists of Australasia. Iron Studies Standardised Reporting Protocol. 2nd edition. 2021. Source
- Pathology Tests Explained. Iron studies. Source
- Camaschella C. Iron-deficiency anemia. New England Journal of Medicine. 2015. Source
- Pasricha SR, Tye-Din J, Muckenthaler MU, Swinkels DW. Iron deficiency. The Lancet. 2021.