Fasting Blood Sugar (FBS)
Measures the sugar in your blood after not eating overnight.
Also called: Fasting glucose, fasting plasma glucose
What is it?
This test measures blood sugar after at least 8 hours without food. It is a basic test to find pre-diabetes and diabetes.
How to prepare
Do not eat or drink anything except water for 8 to 10 hours before the test. Take your usual medicine only if your doctor says so.
Report time: Usually within a few hours.
Usual numbers
| Measure | Typical adult range |
|---|---|
| Normal | 70 to 99 mg/dL |
| Pre-diabetes range | 100 to 125 mg/dL |
| Diabetes range | 126 mg/dL or higher on repeat testing |
Ranges are typical values used in India. Every lab prints its own range on your report, and that range is the one to follow. A number outside the range does not always mean disease. Your doctor decides what it means for you.
What labs charge
| Lab | Price | City | Source | Checked |
|---|---|---|---|---|
| Dr Lal PathLabs | ₹80 | Pune (home-collection listing; page header is unclear) | Bajaj Finserv Health listing | 13 Nov 2026 |
| Tata 1mg Labs | ₹89 | Page shows Gurgaon; city not confirmed | 1mg.com lab packages page | 13 Nov 2026 |
Prices change often and can differ by city, home collection and offers. Always confirm the final price on the lab’s own page before you book. Labs not listed here have not been checked yet.
Questions people ask
Can I drink water before the test?
Yes. Plain water is fine.
What if my reading is slightly high once?
One reading is not a diagnosis. Your doctor will usually repeat it or add an HbA1c test.
Medical review: This page is general information. A qualified doctor will review our medical pages and the reviewer’s name and date will be shown here. Until then, please treat it as a starting point and speak to your doctor.