The Fasting Blood Glucose Test is the Most Common Way to Diagnose Diabetes

The most common test for diabetes in children and nonpregnant adults is called the Fasting Blood Glucose Test. The test would indicate diabetes if it shows a blood glucose level of 126 milligrams per deciliter (mg/dL) or more after an 8-hour fast. This test is most reliable when done in the morning. However, a diagnosis of diabetes can be made based on two other tests, provided the results are confirmed by retesting on a different day:

  • A blood glucose level of 200 mg/dL or more 2 hours after drinking a beverage containing 75 grams of glucose dissolved in water. This test is called the oral glucose tolerance test (OGTT).
  • A random (taken at any time of day) blood glucose level of 200 mg/dL or more, along with the presence of diabetes symptoms.

NDIC (National Diabetes Information Clearinghouse)
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