The thalassaemias are a group of recessively autosomal inherited disorders in globin chain production (1).
Inheritance of an affected gene from both parents results in a disorder and inheritance of only one affected gene results in a healthy carrier, sometimes called a trait. (3) There are other less serious thalassaemia disorders which can be detected by the screening programme
Classification of the disease is according to the clinical severity (phenotype) or type of mutation (genotype) (1).
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