The study observations revealed that ALT in the diabetic retinopathy group was lower than in the T2DM patients without any complications (23.9 ± 10.9 IU/L vs 28.7 ± 23.0 IU/L, respectively, P<0.05), and there was a decreasing trend of ALT in the diabetic nephropathy group, though not statistically significant (26.7 ± 14.1 IU/L vs 28.7 ± 23.0 IU/L, respectively) (11). Here, GPT is linked to diabetic retinopathy.