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BACKGROUND and Objective: β thalassemia major is a severe disease with high morbidity. The world prevalence of carriers is around 1.5–7%. The aim of the present study was to find a reliable formula for detecting β thalassemia carriers using a large database of more than 22,000 samples obtained from a homogeneous population of childbearing age women with 14% of β thalassemia carriers and to check previously published formulas. METHODS: We applied a mathematical method based on the support vector machine (SVM) algorithm in the search for a reliable formula that can differentiate between thalassemia carriers and non-carriers, including normal counts or counts suspected to belong to iron-deficient women.RESULTS: Shine's formula and ours showed >98% sensitivity and >99.77% NPV. All other published formulas gave inferior results. CONCLUSIONS: We found a reliable formula that can be incorporated into any automatic blood counter to alert health providers to the possibility of a woman being a β thalassemia carrier. A further simple hemoglobin characterization by HPLC analysis should be performed to confirm the diagnosis, and subsequent family studies should be carried out. Our SVM formula is currently limited to women of fertility age until further analysis in other groups can be performed

DETECTION OF Β THALASSEMIA CARRIERS BY RED CELL PARAMETERS OBTAINED FROM AUTOMATIC COUNTERS USING MATHEMATICAL FORMULAS