In the absence of unequivocal hyperglycemia, an abnormal A1c, fasting glucose or oral glucose tolerance test result that meets criteria for diabetes should be confirmed by repeat testing before assigning a diagnosis of T2DM.
- It is preferable that the same test be repeated for confirmation of diabetes. There may be cases in which two different tests are available (e.g., A1c and fasting glucose). If both tests meet diagnostic criteria for diabetes, a diagnosis of diabetes can be made.
- If two different tests are available and are discordant (e.g., A1c > 6.5%, fasting glucose < 126 mg/ dL), then the test whose result is above the diagnostic threshold should be repeated. If it is again above the diagnostic threshold on repeat testing, a diagnosis of diabetes can be assigned.