• Diabetes Diagnosis and Tests

Diagnosis and Tests
diabetes diagnosis and tests

Laboratory tests for blood:

Random blood sugar test 200 milligrams per deciliter (mg/dL) OR higher = Diabetes
Fasting blood sugar test

Less than 100 mg/dL is Normal

100 to 125 mg/dL is considered Prediabetes

126 mg/dL or higher on two separate tests, you have diabetes

Post-Prandial glucose test

Up to 140 is normal

140-199 is Prediabetes

≥ 200 indicates Diabetes

Oral glucose tolerance test

less than 140 mg/dL is normal

between 140 and 199 mg/dL indicates prediabetes.

more than 200 mg/dL after two hours indicates diabetes

Random blood sugar test: A blood sample will be taken at a random time, regardless of when you last ate.

Fasting blood sugar test: A blood sample will be taken after an overnight fast.

Postprandial blood sugar test: Testing of blood sugar levels 2 hours after a meal.

Oral glucose tolerance test: For this test, you fast overnight, and the fasting blood sugar level is measured. Then you drink a sugary liquid, and blood sugar levels are tested periodically for the next two hours.

Glycated hemoglobin (A1C) test:

This blood test indicates your average blood sugar level for the past two to three months.

The higher your blood sugar levels, the more hemoglobin you'll have with sugar attached.

  • An A1C level of 6.5 percent or higher on two separate tests indicates that you have diabetes.
  • An A1C between 5.7 and 6.4 percent indicates prediabetes.
  • Below 5.7 is considered normal.
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