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Home > Diabetes Center > About Diabetes > Diabetes Mellitus

Diagnosis

Patient history and physical examination are needed.
Diagnosis is made when fasting blood tests show high glucose levels (126 mg/dL or greater).
When test results are ambiguous, a glucose tolerance test may be done. A drink containing 75 grams of glucose is swallowed and blood glucose levels are measured every 30 minutes over a two-hour period.
Urine samples may be analyzed for protein content.
Blood glycohemoglobin is calculated as the average of blood glucose level readings over the preceding two months.

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