There remains some disagreement on the use of the oral glucose tolerance test (OGTT) in diabetes testing and diagnosis. Those that recommend using OGTT assert that the OGTT better detects diabetics who are at risk for developing complications associated with diabetes.
The ADA discourages the use of the OGTT for at-risk individuals unless blood glucose and HbA1C concentrations remain below diagnostic ranges for diabetes but patient displays symptoms of diabetes.
The OGTT is utilized to diagnose gestational diabetes. Those at risk for gestational diabetes are screened with FPG, casual, and sometimes a 50-g oral glucose load. Definitive diagnosis of gestational diabetes is made with a glucose challenge test of 100-g or 75-g glucose and timed blood glucose measurements (OGTT).
