Learn more about what to ask your doctor.
Anyone 45 years old or older should consider getting tested for diabetes (especially if you are overweight). Also, consider getting tested if you are younger than 45, overweight, and one or more of the following risk factors is true:
The best way to find out if you have type 2 diabetes is to talk to your doctor and request a blood test. The three types of blood tests that are commonly used to diagnose diabetes and prediabetes are the A1c test, fasting plasma glucose level test, and the oral glucose tolerance test.
The A1c is a blood test results show what a person’s average blood sugar has been for the past 2-3 months. A normal range of blood sugar is less than 5.7%.
Normal: Less than 5.7%
Diabetes: Equal to or greater than 6.5%
Fasting Plasma Glucose Level Blood Test
The fasting plasma glucose level test measures blood sugar in a person who has been fasting (not eating) for at least eight hours. This is the most common test used to diagnose type 2 diabetes.
Normal: Less than 100 mg/dL
Prediabetes: 100 to 125 mg/dL
Diabetes: Greater than 125 mg/dL
Oral Glucose Tolerance Test (2-hour Post-Glucose Challenge)
This test is done two hours after a person fasts (for at least eight hours) and then drinks a beverage containing sugar. This test is also used to diagnose gestational diabetes (diabetes during pregnancy).
Normal: Less than 140 mg/dL
Prediabetes (impaired glucose tolerance): 140 to 199 mg/dL
Diabetes: Equal to or greater than 200 mg/dL