Blood sugar level after an overnight fast.
The amount of glucose in your blood after fasting.
To screen for and monitor diabetes.
Fast for 8–12 hours (water is allowed) before the test.
A blood sample is drawn from a vein.
| Group | Normal range |
|---|---|
| Normal | 70 – 99 mg/dL |
| Diabetes | ≥ 126 mg/dL |
| Prediabetes | 100 – 125 mg/dL |
Ranges vary slightly between laboratories.
High values may indicate diabetes; very low values may indicate hypoglycaemia.
Related conditions: Diabetes, Hypoglycaemia
Related tests: HbA1c, Postprandial Glucose