Iron deficiency anaemia — OSCE

Candidate brief

You are the paediatric registrar. The patient is a 20-month-old boy who presented with pallor and irritability. His haemoglobin is 74 g per litre with a mean cell volume of 65 fL and a ferritin of 4 micrograms per litre, confirming iron deficiency anaemia. He drinks about 900 mL of cow's milk per day and eats very little solid food. The consultant has asked you to explain to his parents what the diagnosis means, why the cow's milk is the main problem, what the iron medicine and the daily changes involve, how they will know it is working, and how to keep him safe. The parents are worried that he is seriously ill and confused about why milk, which they thought was healthy, is causing the problem. Explain clearly, check their understanding, and agree a plan. [4][5]

Marking domains

Clinical knowledge and accuracy (3). Explains that their son's body has run low on iron, the mineral his blood needs to make haemoglobin, so his red blood cells are too small and too pale and too few, which is why he is tired, pale and irritable. Names that the main cause here is the large amount of cow's milk — milk has very little iron, its calcium blocks the body absorbing what iron he does eat, and the big milk fills him up so he does not eat the iron-rich foods he needs. States the treatment clearly: a daily iron medicine at a weight-based dose of 3 to 6 mg per kg per day of elemental iron for at least three months, given once a day or every other day. Corrects the misconception that restricting milk will harm him — the opposite is true. [3][4]

Communication and plain language (3). Avoids jargon or defines it; uses an analogy (the milk is filling him up but not giving him the building blocks his blood needs, like filling a plate with water when he needs solid food). Reassures the parents that this is common, treatable and not a sign of cancer or a serious illness, and that the medicine will rebuild his blood over weeks. Explains the practical points in concrete terms: the medicine may turn his stools dark (normal and harmless), to give it with a little orange juice or vitamin C and not with milk, and that some children get mild tummy upset that usually settles. Paces the information, pauses to check understanding, and invites questions. [5][3]

Management plan and safety-net (3). Lays out the daily plan: give the iron medicine consistently, cut the cow's milk to below 500 mL per day, introduce iron-rich foods such as meat, eggs, beans and fortified cereals, and attend the four-week review to check the haemoglobin is rising. Explains how to tell it is working: a blood test at about four weeks should show the haemoglobin rising, and he should become less pale and more energetic. Gives a clear safety-net: if he is no better at the four-week review, the team will look for other causes such as a problem absorbing iron or a source of bleeding, because a child who does not respond to the medicine needs further tests rather than just more medicine. [1][8]

Empathy and partnership (1). Acknowledges the parents' worry that he is seriously ill and their confusion about milk, validates that milk is generally good but that the quantity here is the issue, and frames the plan as a partnership the family owns day to day with the team's support and a clear review date. [4]

Examiner notes

Strong candidates explain WHY cow's milk causes the deficiency in plain terms (low iron, calcium blocks absorption, fills him up), give a concrete daily plan centred on the medicine plus cutting the milk below 500 mL per day and adding iron-rich foods, and name the expected response at four weeks with a clear refractory safety-net. Weak candidates prescribe the medicine without addressing the milk, fail to explain the dark stools (causing avoidable alarm), or omit the four-week review and the plan for a non-responder. The distinction between iron deficiency (a treatable, common nutritional problem) and a serious or dangerous illness is a key discriminator at the high end, as is the reassurance that the pale, tired child will recover with consistent treatment and dietary change. [3] [5]