How is the fasting plasma glucose test (FPG) done?
The fasting plasma glucose test can be done after an overnight fast or after an eight-hour fast during the day. It is a relatively easy, inexpensive test. After the fast, a simple blood test measures glucose levels before you eat again. The test results indicate whether your blood glucose level is normal or whether you have prediabetes or diabetes: • Normal: Normal blood sugar levels measure less than 100 mg/dl (milligrams per deciliter) after the fasting glucose test. • Prediabetes: Blood glucose levels of 100-125 mg/dl after an overnight or eight-hour fast is diagnosed as prediabetes. People with these results are considered to have impaired fasting glucose (IFG). • Diabetes: Diabetes is diagnosed when the blood glucose is 126 mg/dl or above.
