American Diabetes Association[2]

One of four tests can be used to establish a firm diagnosis of diabetes:

  • Fasting plasma glucose (FPG) ≥126 mg/dL (most commonly used)

  • HbA1c ≥6.5%

  • 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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