What is the difference between iron deficiency and iron deficiency anaemia?

Iron deficiency refers to depleted iron stores — detected by a low serum ferritin. Iron deficiency anaemia refers to iron deficiency severe enough to impair red blood cell production, causing a low haemoglobin. You can have significant iron deficiency with entirely normal haemoglobin — and this is common in premenopausal women and people with high iron turnover. The clinical relevance is that symptoms including fatigue, brain fog, exercise intolerance, and restless legs can appear at the iron deficiency stage, before anaemia develops. Ferritin, not haemoglobin, is the right first test.

What ferritin threshold should GPs use for iron deficiency?

This is genuinely contested. Many laboratories report ferritin as 'normal' at levels that most clinical guidelines would consider iron-depleted. The World Health Organization threshold is 15 µg/L; WEHI's new test uses 30 µg/L as its reference cut-off. RACGP and eTG guidance recommends interpreting ferritin in the context of clinical presentation and noting that ferritin is an acute-phase reactant — it can be falsely elevated in inflammation, masking iron deficiency. For symptomatic women with fatigue, it is worth treating iron deficiency at ferritin below 30 µg/L if the clinical picture fits, rather than waiting for the level to drop below the laboratory's lower reference limit.

A 15-minute iron deficiency test from Australia — not yet here

What just happened

Researchers at the Walter and Eliza Hall Institute of Medical Research (WEHI) have developed a rapid diagnostic test for iron deficiency — a finger-prick blood sample, results in 15 minutes, no laboratory equipment required. The test measures ferritin, the gold-standard biomarker for iron stores, and includes a built-in reference line at 30 µg/mL so results can be interpreted at the point of care without sending a sample away.

It is designed to detect iron deficiency before it progresses to anaemia — which is precisely where the current system fails. A blood count that looks normal can coexist with iron stores that are significantly depleted. Many women are told their iron is fine because their haemoglobin is within the normal range, when their ferritin tells a different story.

The test is not yet available in Australia. It is currently in validation studies in Malawi and Kenya — designed initially to address iron deficiency in lower-resource settings where laboratory infrastructure is limited. But the technology is relevant to Australian general practice, and it is worth understanding what it offers and where the gaps remain.

The both-and

Why this matters for the patients GPs see every day

Iron infusions are among the most frequently prescribed treatments in Australia — a statistic that reflects both the prevalence of iron deficiency and the fact that oral iron is poorly tolerated by many people. The patients who need iron treatment most are disproportionately women: premenopausal women with heavy menstrual bleeding, pregnant women, and peri- or postmenopausal women whose symptoms are frequently attributed to hormonal changes when iron stores are also depleted.

The current pathway requires a venous blood draw, laboratory processing, and a return visit or phone call for results. In a busy general practice, this creates delay. In a patient who has already normalised fatigue as “just what my life is like,” it creates another reason not to push for answers. A rapid, accessible test changes that equation — not just in resource-limited settings, but in any context where speed and accessibility affect whether a diagnosis gets made.

The WEHI test was co-developed by Professor David Anderson and researcher Huy Van. What makes it clinically meaningful is the decision it enables before the laboratory result arrives: the reference line at 30 µg/mL is clinically thoughtful. Many Australian laboratories report normal ferritin at thresholds below this — meaning women with ferritin between 15 and 30 µg/mL may be told they are normal when their iron stores are functionally depleted. A test designed around the 30 µg/mL threshold bakes in a more clinically appropriate cut-off.

What is genuinely uncertain

The test is in early-stage real-world evaluation. The validation studies being conducted in Malawi and Kenya will assess how it performs in conditions very different from a controlled research environment — variable humidity, temperature, sample handling, user training. Those are the conditions that break point-of-care tests that look excellent in the lab.

There is also the question of sensitivity and specificity across the full range of patients who would use it. Iron deficiency coexists with inflammation in many people — patients with chronic disease, obesity, autoimmune conditions — and ferritin is an acute-phase reactant. A ferritin that is falsely elevated by inflammation can mask depleted iron stores, a limitation that applies to any ferritin test, not just this one. How well the rapid test performs in that population, where GPs most need diagnostic precision, will need to be established.

The timeline to Australian regulatory evaluation and potential clinical availability is not stated. TGA review, followed by any PBS or Medicare Benefits Schedule consideration for a point-of-care test, is a multi-year process after clinical validation is complete. The technology is promising; the pathway to an accessible, listed diagnostic is long.

My two cents

Iron deficiency is an underdiagnosed condition in Australian women, and the diagnostic gap is largely systemic. The laboratory pathway works — but it requires a clinician to suspect the diagnosis, order the right test (ferritin, not just a blood count), and then have a follow-up conversation when the result arrives. At each step, there are patients who fall through.

The WEHI test is designed for settings where the entire pathway from test to result to treatment decision happens in a single encounter. That is not a marginal convenience — for a patient who has been symptomatic for years and has never been offered an explanation, a same-visit result changes the nature of the consultation.

While we wait for validation, approval, and availability: if a woman in your practice has unexplained fatigue, brain fog, reduced exercise tolerance, or heavy periods, and you have not recently checked a ferritin, now is a good time to do so. The laboratory test is available today. The rapid test is coming — but general practice can start closing the gap without it.

Verdict: maybe — the technology addresses a real diagnostic gap in AU general practice, particularly for women. Watch for TGA registration and clinical validation results before changing diagnostic pathways.

Sources cited

New blood test detects iron deficiency in 15 minutes — Medical Republic, 31 August 2026. https://www.medicalrepublic.com.au/new-blood-test-detects-iron-deficiency-in-15-minutes/128602