Hemoglobin typing of 24 CBSs identified 19 cases of Hb A2A (normal hemoglobin, without excluding alpha‐thalassemia), 4 cases of Hb E traits, and 1 case of homozygous Hb E. Hemoglobin variants can interfere with HbA1C measurement. This evidence concerns the gene GSTM1 and Alpha-thalassemia.