diabetes mellitus is characterized by recurrent or persistent hyperglycemia, and is diagnosed by demonstrating any one of the following: fasting plasma glucose level at or above 126 mg/dL (7.0 mmol/l).

plasma glucose at or above 200 mg/dL (11.1 mmol/l) two hours after a 75 g oral glucose load as in a glucose tolerance test. random plasma glucose at or above 200 mg/dL (11.1 mmol/l). A positive result, in the absence of clinical symptoms of diabetes, should be confirmed by another of the above-listed methods on a different day.

Most physicians prefer to measure a fasting glucose aim because of the ease of measurement and the considerable time commitment of formal grape-sugar tolerance testing, what one. takes two hours to complete. According to the current definition, two fasting glucose measurements above 126 mg/dL (7.0 mmol/l) is considered diagnostic for diabetes mellitus.