Diabetes Diagnosis

Our specialized group of physicians and health care providers diagnose and treat diabetes on a daily basis. Since every person with diabetes experiences it differently, we offer a team of experts who provide individualized care.

Diabetes Diagnosis in Burlington, VT

diabetes diagnosisThere are several different tests used to diagnosis diabetes. Testing should be repeated on a different day to confirm a diagnosis of diabetes. Testing takes place in a clinic setting of Fletcher Allen laboratory. If your blood glucose level is very high, or if you have classic symptoms of high blood glucose in addition to one positive test, your medical provider may not require a second test to diagnose diabetes.

To be diagnosed with diabetes you must meet one of the following criteria:

  • Fasting Blood Glucose: a fasting blood glucose of greater than or equal to 126 mg/dl. Fasting means after not having anything to eat or drink except water for at least 8 hours before the test.
  • A1C: The A1C also called the hemoglobin A1C test, shows the amount of glucose that sticks to the red blood cell, which is proportional to the amount of glucose in the blood.  This test measures your average blood glucose for the past 2 to 3 months. A1C is not a fasting lab test. An A1C level > 6.5 is positive for diabetes.
  • Random (also called Casual) Plasma Glucose Test: This test is a blood check at any time of the day when you have diabetes symptoms. If the blood glucose is greater than or equal to 200 mg/dl you are diagnosed with diabetes.
  • Oral Glucose Tolerance Test (also called the OGTT): This is a two-hour test that checks your blood glucose levels before and 2 hours after you drink a beverage containing glucose. An OGTT is most commonly done to check for diabetes that occurs with pregnancy (gestational diabetes). Diabetes is diagnosed at 2 hour blood glucose of greater than or equal to 200 mg/dl

Diagnosis of Prediabetes

Sometimes testing finds blood glucose levels higher than normal but not high enough to diagnose diabetes. This indicates you have a condition known as prediabetes and are at risk of developing diabetes in the future.

Test results indicating prediabetes are:

  • A1C: 5.7% – 6.4%
  • Fasting blood glucose:  100 – 125 mg/dl
  • An OGTT 2 hour blood glucose: 140 mg/dl – 199 mg/dl

Learn more about Diabetes treatments, find a Fletcher Allen provider or call 802-847-4576.