It is a clinical diagnosis when a thalassemia case remains well without blood transfusion for more than 2 years and maintains a reasonable Hb (i.e. > 8gm/dl). It is also called non-transfusion- dependent thalassemia (NTDT). This results from various permutations and combinations of mild and severe thalassemia genes, some genetic changes and other hemoglobinopathies.
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