Thalassemia
An inherited condition in which the body makes less of one of the haemoglobin chains, leading to small, pale red cells and anaemia. It ranges from a harmless carrier state (trait) that causes only a mild anaemia to a severe form needing lifelong transfusions.
What it is
Thalassaemia is a group of inherited blood disorders in which the body produces less of one of the protein chains that make up haemoglobin — either the alpha chain (alpha-thalassaemia) or the beta chain (beta-thalassaemia). The result is red blood cells that are smaller and paler than normal and an anaemia whose severity depends on how many of the genes are affected. In the mildest and commonest form — thalassaemia trait (carrier) — a person inherits one affected gene, has only a mild anaemia with small red cells, and usually needs no treatment; often it is discovered incidentally and mistaken at first for iron deficiency, which it superficially resembles. More severe forms, where more genes are affected, cause a significant anaemia. The most serious, beta-thalassaemia major, appears in early childhood and requires regular blood transfusions for life, along with treatment to manage the iron overload that transfusions cause. Thalassaemias are most common in people of Mediterranean, Middle Eastern, South Asian, Southeast Asian and African origin. The diagnosis is made with a blood count and haemoglobin analysis, and often genetic testing. Because it is inherited, carrier testing and genetic counselling are important for family planning.
Key lab markers
- Full blood count — mild-to-marked anaemia with a low MCV and MCH (small, pale cells).
- Hemoglobin electrophoresis — the key diagnostic test; identifies the haemoglobin pattern.
- HbA2 — characteristically raised in beta-thalassaemia trait.
- Ferritin and iron studies — normal iron distinguishes it from iron-deficiency anaemia (which it resembles).
- Reticulocytes and bilirubin — may be raised where red-cell turnover is increased.
- Genetic testing — confirms the specific type and is used in counselling.
Symptoms
- Often none in the trait (carrier) form
- Tiredness and pallor if anaemia is significant
- In more severe forms: poor growth in childhood, bone changes, an enlarged spleen
- Jaundice from increased red-cell breakdown
- In transfusion-dependent forms, complications of iron overload over time
Related lab panels
When to discuss with a doctor
Thalassaemia trait is usually harmless and needs no treatment, but recognising it matters: it is easily confused with iron deficiency, so people can be given iron they do not need, and — most importantly — if both partners carry a haemoglobin trait, there is a risk of a child with a severe form, which is why carrier testing and genetic counselling before or during pregnancy are so valuable. A microcytic anaemia that does not respond to iron, or a low MCV with normal iron studies, should prompt haemoglobin analysis. More severe thalassaemia is managed by specialists with transfusions and iron-overload treatment. Mediora.AI can flag the small-red-cell, normal-iron pattern that suggests a thalassaemia rather than iron deficiency, but confirming the diagnosis, arranging carrier testing and any counselling belong with your doctor.