What happens during the test?
The test is best done in the morning because it requires you to fast for at least 8 hours and not exceeding 12 hours. This means you cannot eat or drink anything (other than sips of water) 8 hours before FBS. In the clinic or hospital, a healthcare worker will draw blood from you and submit it to the laboratory for testing.
How do they diagnose type 2 diabetes using FBS?
When you receive the results of your FBS, you’ll see numbers:
- A blood sugar level of 99 mg/dl or lower is normal.
- If it’s 100 to 125 mg/dl, it could mean prediabetes.
- A result of 126 mg/dl or higher on two separate FBS means the patient has diabetes.
What else should I know?
In some instances, the doctor may opt for a random plasma glucose test or random blood sugar (RBS), instead of FBS.
For an RBS, you don’t need to fast; the doctor will draw your blood sample any time of the day, regardless of when you last ate. A result of 200 mg/dl or higher indicates diabetes.
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