American Diabetes Association[2]

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

  • Fasting plasma glucose (FPG) >6.9 mmol/L (>125 mg/dL) (most commonly used)

  • Random plasma glucose ≥11.1 mmol/L (≥200 mg/dL) with diabetes symptoms such as polyuria, polydipsia, fatigue, or weight loss

  • 2-hour post-load glucose ≥11.1 mmol/L (≥200 mg/dL) on a 75 g oral glucose tolerance test

  • HbA1c ≥48 mmol/mol (≥6.5%).

All of these require 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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