Transferrin saturation is a calculated value, not a separate substance measured in blood: serum iron divided by transferrin, shown as the percentage of iron-binding sites occupied. Practitioners use it with ferritin to confirm iron deficiency and as the first screen for haemochromatosis. Recent iron intake, non-fasting collection and inflammation distort it, so a first high result is worth repeating. Practitioners can order it through the Vively practitioner platform.
| Test type | Calculated by the lab from other results |
|---|---|
| Measurements required | Serum iron and transferrin. The lab calculates the saturation and prints it on the report. |
| Sample and collection | Blood draw at a collection centre |
| Preparation | Book a morning collection and fast for 8 to 12 hours beforehand, water only. |
| 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 Transferrin saturation reference and optimal ranges?
| Typical lab reference | Vively optimal | |
|---|---|---|
| Adults | 20 to 45% | 24 to 40% |
Labs differ, so read the result against the range printed on the client's report (RCPA guidance). The optimal range is a monitoring target, not a diagnostic cut-off.
Check a client's Transferrin saturation result
Your lab calculates Transferrin saturation for you. Enter the value printed on your client's 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 Transferrin saturation 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 Transferrin saturation, 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 Transferrin saturation?
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
Why does the optimal range sit there?
Our 24 to 40% band sits inside the 20 to 45% lab range, keeping a margin from both edges so drift in either direction shows early.
Below about 20%, iron supply to the marrow starts to limit red cell production. Saturation below 16% is a long-standing marker of iron-deficient erythropoiesis.
A fasting saturation of 45% or more is the accepted trigger to investigate haemochromatosis, which is relatively common in Australians of northern European ancestry.
Saturation inherits all of serum iron's variability, so a single result outside the band needs a fasting repeat before it carries much weight.
What should Transferrin saturation be read with?
- ContextSaturation below 20%, ferritin below 30 µg/L
Iron deficiency with limited supply to the marrow.
- LowLow saturation, normal or high ferritin, raised hs-CRP
Often seen with inflammation (functional iron deficiency); GP review if it persists.
- ContextSaturation 45% or above with raised ferritin
Possible haemochromatosis; GP review for HFE gene testing.
- HighHigh saturation, normal ferritin
Often a recent iron dose or a non-fasting sample; repeat fasting.
What can affect a Transferrin saturation result?
- Oral iron or a large iron-rich meal in the previous 24 hours
- Non-fasting or afternoon collection
- Inflammation, which lowers serum iron and so lowers saturation
- Oestrogen (combined pill, HRT, pregnancy), which raises transferrin and can pull saturation down
When should you refer the client to their GP?
- Fasting saturation of 45% or higher on a repeat sample, especially with ferritin above the lab range
- Saturation below 20% with low ferritin or anaemia
- High saturation with abnormal liver enzymes, joint pain or a family history of haemochromatosis
How should a client prepare for a Transferrin saturation test?
Copy or print this to send to your client.
Preparing for your Transferrin saturation test
- Book a morning collection and fast for 8 to 12 hours beforehand, water only.
- Pause any over-the-counter iron supplement for 24 hours before your test, as a recent dose can make saturation look falsely high.
- If a doctor prescribed your iron, check with them before pausing it.
- 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 Transferrin saturation with clients?
A first high saturation is usually a timing or supplement artefact, so repeat it fasting before haemochromatosis comes up with the client. If it stays at 45% or above, the client's GP can request HFE gene testing.
Transferrin saturation FAQs
What saturation should trigger a haemochromatosis work-up?
A fasting transferrin saturation of 45% or higher on a repeat sample, particularly with a raised ferritin. The client's GP can then request HFE gene testing. Haemochromatosis is one of the more common inherited conditions in Australians of northern European ancestry, and early treatment prevents organ damage, so pass a confirmed high result on promptly.
Is saturation better than ferritin for spotting iron deficiency?
No, they answer different questions. Ferritin shows stores and is the better single test for deficiency. Saturation shows supply to the marrow at the time of collection, and it is more useful when inflammation has lifted ferritin into the normal range. Read the two together, with hs-CRP, before drawing a conclusion.
Can a naturopath, nutritionist or dietitian order transferrin saturation 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 repeat a high transferrin saturation fasting before raising haemochromatosis?
A first high result is usually a timing or supplement artefact. Oral iron or an iron-rich meal in the previous 24 hours, or a non-fasting or afternoon sample, can all push it up. If a fasting repeat stays at 45% or higher, especially with raised ferritin, the client's GP can consider HFE gene testing.
Can transferrin saturation be low when ferritin is normal?
Yes. Inflammation lowers serum iron and so lowers saturation, which gives a pattern of low saturation with normal or high ferritin and raised hs-CRP, sometimes called functional iron deficiency. Oestrogen from the combined pill, HRT or pregnancy raises transferrin and can pull saturation down too. GP review is reasonable if it persists.
References
- Royal College of Pathologists of Australasia. Iron Studies Standardised Reporting Protocol. 2nd edition. 2021. Source
- Medical Journal of Australia. Updating the diagnosis and management of iron deficiency in the era of routine ferritin testing. 2024;221(7). Source
- Pathology Tests Explained. Iron studies. Source
- Pasricha SR, Tye-Din J, Muckenthaler MU, Swinkels DW. Iron deficiency. The Lancet. 2021.