GPT and type 2 diabetes mellitus: This study showed that T2DM patients with a duration of illness greater than 5 years display a significant (P < 0.05) increased serum level of ALT, AST, GGT and ALP activities and were significantly more at risk (aOR: 6.238; P = 0.001) of having abnormal liver enzyme profile, compared to those with less than 5 years history of the disease.