American Diabetes Association
One of four tests can be used to establish a firm diagnosis of diabetes:
Fasting plasma glucose (FPG) ≥126 mg/dL (most commonly used)
2-hour post-load glucose ≥200 mg/dL on a 75 g oral glucose tolerance test
Random plasma glucose ≥200 mg/dL with diabetes symptoms such as polyuria, polydipsia, fatigue, weight loss, or hyperglycemic crisis.
In the absence of unequivocal hyperglycemia, diagnosis requires confirmation with a second test, which may be the same test or a different test. One option is to test both HbA1c and FPG on a single blood sample.
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