The Fasting Blood Sugar test measures the level of glucose (sugar) in your blood after not eating or drinking anything (except water) for 8 to 10 hours. It’s a key test used to detect and monitor diabetes and pre-diabetes.
To diagnose diabetes or prediabetes
To monitor blood sugar levels in diabetic patients
As part of a routine health check-up
Sample Required:
A blood sample (taken after fasting)
Fasting Required: Yes
Do not eat or drink anything other than water for 8-12 hours before the test
✅ Fasting Blood Sugar Levels:
| Category | mg/dL | mmol/L |
|---|---|---|
| Normal | 70 – 99 | 3.9 – 5.5 mmol/L |
| Prediabetes | 100 – 125 | 5.6 – 6.9 mmol/L |
| Diabetes | 126 or higher | 7.0 mmol/L or higher |






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