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D56.3 – Thalassaemia Minor: Causes & Diagnosis
D56.3 is the ICD-10 code for thalassaemia minor, a hereditary blood disorder affecting haemoglobin production. Most carriers experience mild or no symptoms.
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D56.3 is the ICD-10 code for thalassaemia minor, a hereditary blood disorder affecting haemoglobin production. Most carriers experience mild or no symptoms.
What is D56.3 – Thalassaemia Minor?
D56.3 is the ICD-10 diagnosis code for thalassaemia minor, also known as the thalassaemia trait or carrier state. It is a hereditary disorder affecting the synthesis of haemoglobin – the protein in red blood cells responsible for carrying oxygen. In thalassaemia minor, only one defective gene copy is present, meaning the condition is usually mild or entirely asymptomatic.
Causes
Thalassaemias are caused by genetic mutations that reduce or impair the production of alpha- or beta-globin chains, which are essential components of haemoglobin. In thalassaemia minor (D56.3), the affected person has inherited only one defective gene copy (heterozygous form). The second gene copy functions normally, allowing sufficient haemoglobin production to continue.
- Beta-thalassaemia minor: Mutation in the HBB gene on chromosome 11
- Alpha-thalassaemia minor: Deletion or mutation affecting one to two alpha-globin genes on chromosome 16
- Autosomal recessive inheritance: Both parents can be carriers without being severely affected themselves
Symptoms
Thalassaemia minor is frequently asymptomatic and may go unnoticed for years. When symptoms do occur, they are typically mild:
- Mild anaemia with slightly reduced haemoglobin levels
- Small red blood cells (microcytosis) and pale red blood cells (hypochromia)
- Occasional fatigue or reduced stamina during physical activity
- Mild enlargement of the spleen (splenomegaly) in rare cases
During pregnancy, thalassaemia minor may increase iron requirements and worsen any existing anaemia, requiring closer monitoring.
Diagnosis
Thalassaemia minor is typically identified through a full blood count and confirmatory tests:
- Full blood count (FBC): Low MCV (mean corpuscular volume) and low MCH (mean corpuscular haemoglobin) values are characteristic findings
- Haemoglobin electrophoresis or HPLC: Elevated HbA2 levels confirm beta-thalassaemia minor
- Molecular genetic testing: Identifies the specific mutation; especially important for family planning
- Ferritin and serum iron: To rule out concurrent iron deficiency anaemia, which can present similarly
Treatment
Since thalassaemia minor is usually asymptomatic, no specific treatment is generally required. However, the following measures are relevant:
- Regular blood count monitoring to track any changes
- Avoid unnecessary iron supplementation: Iron therapy is only appropriate if iron deficiency is confirmed – otherwise, iron overload can occur
- Genetic counselling: Essential for couples planning a family, as two carriers have a 25% chance with each pregnancy of having a child with severe thalassaemia major (D56.1)
- During pregnancy: Close monitoring, folic acid supplementation, and collaboration between obstetric and haematological care teams
Genetic Counselling and Family Planning
When both partners are carriers of thalassaemia minor, there is a 25% probability with each pregnancy that the child will inherit thalassaemia major, a severe and potentially life-threatening condition requiring regular blood transfusions. Prenatal diagnosis and genetic counselling are strongly recommended. In countries with a high carrier frequency – including the Mediterranean region, the Middle East, and Southeast Asia – national screening programmes are in place.
References
- World Health Organization (WHO): Management of Haemoglobin Disorders. Report of a Joint WHO-TIF Meeting, Nicosia, 2007.
- Galanello R, Origa R: Beta-thalassemia. Orphanet Journal of Rare Diseases, 2010; 5:11. DOI: 10.1186/1750-1172-5-11.
- Weatherall DJ: The inherited diseases of haemoglobin are an emerging global health burden. Blood, 2010; 115(22): 4331–4336. DOI: 10.1182/blood-2010-01-251348.
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