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  • Title: Diagnosis of alpha-thalassemia trait from Coulter Counter 'S' indices.
    Author: Hegde UM, White JM, Hart GH, Marsh GW.
    Journal: J Clin Pathol; 1977 Sep; 30(9):884-9. PubMed ID: 915018.
    Abstract:
    A number of patients of Mediterranean and Asian origins were found to have unexplained microcytic hypochromic red blood cells. Iron deficiency and beta-thalassaemia trait were both satisfactorily excluded in all of them. The haematological indices of these patients, obtained on a Coulter Model 'S' Counter, were found to be very similar to those seen in obligatory heterozygotes for alpha-thalassaemia. It is postulated that these patients were also carriers for alpha-thalassaemia. Subsequent investigation of some of these patients showed the characteristically reduced rates of alpha-chain synthesis seen in this condition. The discriminant function of England and Fraser (1973) may be of help in diagnosing this state. alpha-Thalassaemia trait should be considered in all patients of 'high-risk' ethnic origins with a blood picture suggestive of beta-thalassaemia trait but in whom the levels of Hb A2 and Hb F are within normal limits.
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