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Thyroid function in thalassaemia major.

F de Luca, R Melluso, G Sobbrio

    Archives of Disease in Childhood
    |May 1, 1980
    PubMed
    Summary
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    Beta-thalassaemia patients often have low thyroxine levels due to decreased thyroxine-binding prealbumin (TBPA) capacity. However, these children remain euthyroid, indicating normal thyroid function despite altered thyroid hormone transport.

    Area of Science:

    • Endocrinology
    • Hematology
    • Pediatrics

    Background:

    • Beta-thalassaemia is a genetic blood disorder affecting hemoglobin production.
    • Thyroid hormone levels and transport proteins can be influenced by chronic illnesses and iron overload.

    Purpose of the Study:

    • To investigate thyroid hormone status in children with beta-thalassaemia.
    • To assess the binding capacity of thyroid hormone transport proteins.
    • To determine if beta-thalassaemia affects thyroid function and hormone levels.

    Main Methods:

    • Radioimmunoassay was used to measure serum concentrations of thyroxine (T4), triiodothyronine (T3), reverse T3 (rT3), and thyroid-stimulating hormone (TSH).
    • A thyrotropin-releasing hormone (TRH) stimulation test was performed.

    Related Experiment Videos

  • Thyroxine-binding globulin (TBG) and thyroxine-binding prealbumin (TBPA) binding capacities were measured using reverse flow zone electrophoresis.

    • Main Results:

    • Patients with beta-thalassaemia exhibited lower mean serum T4 concentrations compared to controls.
    • Serum T3, rT3, TSH levels, and pituitary response to TRH were within normal ranges.
    • A significant decrease in TBPA binding capacity for thyroxine was observed, potentially linked to iron overload affecting liver function.

    Conclusions:

    • The reduced circulating total thyroxine in beta-thalassaemia patients is likely due to decreased TBPA binding capacity.
    • Serum free thyroid hormone concentrations remained normal, suggesting preserved thyroid hormone availability.
    • Children with beta-thalassaemia are considered euthyroid, even with subnormal or low-normal thyroxine levels.