Sixty-nine participants(58%) had children with sickle-cell trait (HbS); 22 (18.5%) with trace C (HbC); 18(15.1%) with alpha-thalassemia trait, identified by the presence of Hb Bart's; and in 10cases (8.4%) the result of the screening was inconclusive, i.e., it was not possible todefine the hemoglobinopathy pattern, suggesting a possible rare hemoglobin, specificallynon-identified by laboratory methods used in the testing (Electrophoresis by IsoelectricFocusing and High Resolution Liquid chromatography). This evidence concerns the gene GSTM1 and alpha thalassemia spectrum.