And is unaffected by geography or ethnic group [26].Among our study population, most cases were of impaired glucose tolerance (FBG: 100.24 ± 18.96; Table 1).Thailand researchers stuided correlation between HbA1c and FBG in 3 hemoglobulin group(normal, hbE and high hbA2), came to conclusion with a positive association between estimated average glucose and FBG. Here, HBA2 is linked to Impaired glucose tolerance.