Which measure is used to diagnose diabetes mellitus based on fasting blood sugar?

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Which measure is used to diagnose diabetes mellitus based on fasting blood sugar?

Fasting plasma glucose is used to diagnose diabetes when the result is 126 mg/dL or higher. This measurement is taken after at least 8 hours without eating, and a value at or above 126 mg/dL indicates diabetes, typically confirmed with a second test on a separate day. The 100–125 mg/dL range is considered impaired fasting glucose (prediabetes), not diabetes, while 140 mg/dL or higher is not the diagnostic threshold for the fasting test. Casual (random) glucose above 200 mg/dL with symptoms can diagnose diabetes, but that is not based on fasting blood sugar.

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