HbA1c has been considered the gold standard as a glycemic indicator for diabetic patients. In last few years research studies have unveiled the potential of glycated albumin (GA). In a study done by Morita et al (2013), results indicated that mean levels of GA were much higher in patients with diabetic retinopathy than those unaffected while levels of HbA1c remained the same between the two groups. In fact, through further analysis, they found GA to be an explanatory variable for diabetic retinopathy. Therefore, measurement of GA is a better predictor for the development of diabetic retinopathy than HbA1 in type 2 diabetic patients. Although HbA1c is established as standard, studies similar to this one suggest that GA should be considered as a viable glycemic indicator.
Morita, Shinya, et al. "Glycated albumin, rather than Hba1c, reflects diabetic retinopathy in patients with type 2 diabetes mellitus." Journal of Diabetes & Metabolism 2013 (2013).