Management of type 2 diabetes mellitus.

Diagnosis. An A1c of 6.5% or greater, confirmed by second test, is diagnostic of diabetes. Alternatively, diabetes can be diagnosed by two separate fasting glucoses ≥ 126 mg/dL; with symptoms, a glucose ≥ 200 mg/dL confirmed on a separate day by a fasting glucose ≥ 126 mg/dL; or 2-hour postload glucose ≥ 200 mg/dl during an oral glucose tolerance test [B]. (See Table 1. See Table 2 for differential diagnosis.)