Diabetes is diagnosed by testing the blood for sugar levels. Blood is taken in the morning after you have fasted overnight. Typically, the body keeps blood sugar levels between 70 and 100 milligrams per deciliter (mg/dL), even after fasting. If a blood sugar level after fasting is greater than 125 mg/dL, diabetes is diagnosed.
Your doctor will examine you to look for signs that you have complications or risk factors that increase the risk of complications. These include:
Source: ADAM Encyclopedia
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