A fasting glucose greater than 126 mg/dL is diagnostic for diabetes.

• A. True
• B. False
• C. Only with symptoms
• D. Only with A1c > 6.5

Answer: (A)

Diagnosing diabetes using fasting glucose hinges on a specific threshold that reflects persistent fasting hyperglycemia when the body isn’t clearing glucose properly overnight. A fasting plasma glucose of 126 mg/dL or higher is the level used to indicate diabetes, and in practice it’s confirmed by repeating the test on another day to rule out a one-time fluctuation. This threshold is one of several accepted diagnostic routes, with other paths including a random glucose of 200 mg/dL or higher with symptoms, or an HbA1c of 6.5% or higher. So the statement is true because meeting that fasting glucose level meets the diagnostic criterion, provided testing is appropriately confirmed.