About the FASTING BLOOD SUGAR
Diagnose diabetes and prediabetes.
Sample Required
Blood (venous sample).
Fasting Requirement
Overnight 8–12 hours fasting required.
Why is this Test Done?
- Diagnose diabetes and prediabetes.
- Monitor glucose control.
General Reference Range
- <100 mg/dL: Normal
- 100–125 mg/dL: Prediabetes (IFG)
- ≥126 mg/dL: Diabetes (repeat to confirm)
What Abnormal Results Mean
Elevated FBS suggests impaired fasting glucose or diabetes; low values indicate hypoglycemia—review drugs, diet, endocrine causes.





