Assessing and treating suspected iron deficiency

Katerina Galkina · EN · 07/10/2026

Discuss symptoms with the GP

Tiredness, breathlessness or hair loss alone does not establish iron deficiency. Explain symptom duration, periods, diet, pregnancy, blood loss and medicines. Bring previous results with units and reference ranges.

The NHS anaemia guide ↗ describes assessment, usually starting with a full blood count. Ask whether iron-store measurements and other investigations are appropriate for your case.

Establish the cause

Ask whether the findings show anaemia, iron deficiency without anaemia or another problem. Do not compare one ferritin result against an arbitrary ideal advertised online.

When the cause is unclear, the clinician may investigate blood loss or refer further. Mention heavy periods, bowel symptoms and medicines affecting the stomach. Buying iron does not complete investigation of the cause.

Agree treatment and manage tolerability

Discuss the preparation, schedule, duration and interactions. Report abdominal side effects to the GP or pharmacist. The regimen and alternatives need review rather than silently abandoning treatment or independently switching to an infusion.

Ask how diet can help and whether dietetic support is appropriate. Expensive supplements do not guarantee a suitable dose or better treatment. Keep iron away from children: the NHS warns about dangerous overdose.

Check the response

Agree repeat-testing timing and who explains results before starting. Feeling better does not necessarily mean the prescribed course is complete. Lack of response warrants discussion of adherence, diagnosis, continuing loss and absorption.

Severe breathlessness, chest pain, collapse or substantial active bleeding requires urgent help. Do not await a routine blood test before seeking assessment of marked deterioration.