Laboratory tests for blood:
|LEVEL OF SUGAR
|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.