Objective To screen abnormal hemoglobin(Hb) by high performance liquid chromatography(HPLC)and identify it by molecular diagnosis. Methods Abnormal Hb was detected by HPLC in 6 297 samples and identified by Sanger DNA sequencing. Results A total of 7 types of abnormal Hb were found,including Hb E(37 cases),Hb Q(18 cases,notably 3 cases of Hb Q-Hb H),Hb S(2 cases),Hb C(2 cases),Hb D-Iran(3 cases),Hb J-Bangkok(8 cases) and Hb J-Mexico(2 cases). Hb E,Hb Q,Hb C and Hb J-Bangkok were identified by DNA sequencing...