Objective To investigate the infl uence of hemoglobin H(HbH) disease on 4 kinds of glycated hemoglobin A1c(HbA_(1c)) systems and the applicability of HbA_(1c) for patients with HbH disease. Methods A total of 27 samples with Hb H disease and 30 control samples were collected. Hb A1 c determinations were performed by boronate affinity high performance liquid chromatography,capillary electrophoresis,turbidimetric immunoassay and ion exchange high performance liquid chromatography. The difference of the 4 syst...