Iron Deficiency Without Anaemia: Why New ASH Guidelines Reflect the Approach We Take at Effect Doctors

At Effect Doctors, we start with the question—not the treatment

Iron deficiency is common, but its presentation is not always straightforward.

Someone can have depleted iron stores while their haemoglobin remains within the normal laboratory range. A standard full blood count may therefore appear reassuring even though iron stores are low.

This is why our approach begins with assessment.

Where a patient’s symptoms and circumstances make iron deficiency a possibility, we can test ferritin rapidly and, where appropriate, undertake more comprehensive blood testing.

Our Rapid Ferritin Test uses a finger-prick sample and provides a result in approximately 15 minutes.

That gives us an immediate indication of whether depleted iron stores could be part of the clinical picture.

It also allows the next decision to be based on evidence rather than assumption.

Why we don’t simply wait for anaemia

Anaemia is not the definition of iron deficiency. Iron deficiency describes insufficient iron stores. Iron-deficiency anaemia occurs when iron availability has become sufficiently compromised to affect haemoglobin production.

There is therefore a stage at which iron stores may be depleted without established anaemia.

This distinction has been recognised clinically for some time. The British Society for Haematology has highlighted the complexity of diagnosing iron deficiency and the limitations of relying on any single laboratory measurement.

The significance of the new ASH guidance is that it provides clearer evidence-based clinical decision limits for diagnosing iron deficiency.

It therefore represents an important step towards standardising an approach that many clinicians have increasingly adopted: looking at iron status before a patient reaches the point of overt anaemia.

Ferritin is important—but it needs context

Ferritin is one of the most useful markers of the body’s stored iron.

Historically, however, there has been considerable variation in the thresholds used to define iron deficiency.

ASH now recommends a ferritin clinical decision limit of ≤30 ng/mL for adults. In some higher-risk groups, including menstruating and pregnant individuals with anaemia, a threshold of ≤50 ng/mL is recommended. Where inflammation is present, ferritin can be more difficult to interpret, and ASH recommends considering ferritin below 100 ng/mL or transferrin saturation below 20% in relevant circumstances.

This illustrates an important point about our approach at Effect Doctors: A ferritin result is not interpreted in isolation.

We consider it alongside symptoms, haemoglobin, other iron markers, medical history and the circumstances of the individual patient.

Finding iron deficiency is only the beginning

A low ferritin result raises another important question: Why is the patient iron deficient? There are many possible explanations.

These can include blood loss, menstrual losses, dietary factors, increased physiological requirements, gastrointestinal conditions and problems with absorption.

For some people, particularly where iron deficiency is recurrent or unexplained, identifying the underlying cause may be as important as replacing the iron itself.

This is why we do not approach iron deficiency simply as a problem of supplementation.

Our process is: Test → assess → understand the cause → treat appropriately → review.

That distinction is important.

When might intravenous iron be appropriate?

Finding a low ferritin does not automatically mean that intravenous iron is required.

For some patients, oral iron may be appropriate. For others, oral iron may not be tolerated, may not be absorbed effectively, may have failed to correct the deficiency, or iron replacement may need to be achieved more rapidly.

Where clinically appropriate, intravenous drips can provide an alternative route of iron replacement.

At Effect Doctors, intravenous iron is provided following medical assessment and appropriate blood testing. The treatment therefore follows the diagnosis—it does not replace it.

This is also why the new ASH announcement should not be interpreted as recommending iron infusions for everyone with a low ferritin. The new guidance concerns diagnosis; ASH has indicated that separate treatment guidance is expected in 2027.

Why the new ASH guidance matters

The importance of the announcement is therefore not simply that a new ferritin number has been published. It represents a broader recognition that iron deficiency and anaemia are not synonymous.

For patients, that distinction can be significant. Someone with persistent symptoms may have a normal haemoglobin result and still have depleted iron stores. Looking only for established anaemia can therefore miss an earlier stage of iron deficiency.

The new ASH guidance provides clearer clinical thresholds intended to reduce that problem. For clinicians already taking a more proactive approach to iron status, the announcement is less a completely new concept than a significant move towards greater consistency and standardisation.

Our approach at Effect Doctors

We believe healthcare should increasingly move towards identifying problems before they become more advanced, where appropriate testing can provide useful information and allow patients and doctors to make better-informed decisions.

Our approach to iron deficiency reflects that philosophy. Rather than asking only whether a patient is anaemic, we can investigate whether their iron stores are adequate.

Rather than assuming that fatigue has a single explanation, we can test for potential contributors.

And rather than moving directly from a blood result to treatment, we consider the wider clinical picture and, where appropriate, investigate why the deficiency has occurred.

For patients experiencing persistent or unexplained symptoms, a Rapid Ferritin Test can be a simple starting point.

Where the result indicates possible iron deficiency, this can be followed by more comprehensive testing and medical assessment.

The key message

You do not have to be anaemic to be iron deficient. The new ASH guidelines provide clearer standards for recognising this.

At Effect Doctors, our approach is to identify iron deficiency early, understand the clinical context and underlying cause, and then determine the most appropriate treatment for the individual patient.

That means looking beyond the question “Is my haemoglobin normal?” and asking the more useful question: “Are my iron stores adequate?”

Sources

American Society of Hematology, ASH Sets New Standards for Diagnosing Iron Deficiency, September 2026.

American Society of Hematology, Clinical Practice Guidelines: Diagnosis of Iron Deficiency.

American Society of Hematology, 2026 Guidelines on Diagnosis of Iron Deficiency: Implementation Tool.

British Society for Haematology, Good Practice Paper for the Laboratory Diagnosis of Iron Deficiency.