Criteria for Diagnosis of Diabetes

The OGTT (oral glucose tolerance testing) is the gold standard for diagnosing diabetes, as it is a blood glucose measurement and measures fasting glucose test the body's ability to use glucose effectively.

The ADA recognizes several criteria, including fasting plasma glucose levels of 126 mg/dL or higher, A1C levels of 6.5% or higher, and plasma glucose levels of 200 mg/dL or higher during an OGTT.

The four primary tests are the fasting plasma glucose test, the OGTT, the A1C test, and random plasma blood glucose during the glucose testing.