What is FBS?
Fasting Blood Sugar (FBS) is a simple blood test that checks your blood glucose level after an overnight fast. It is commonly used to diagnose diabetes and prediabetes, and to monitor blood sugar control in diabetics.
Purpose of the Test
- Diagnose diabetes and prediabetes
- Monitor blood sugar control in people with diabetes
- Screen individuals at risk for high blood sugar
Preparation
- Do not eat or drink anything except water for 8–12 hours before the test.
- Avoid alcohol and intense exercise the day before.
- Continue regular medications unless advised otherwise by your doctor.
Procedure
- A blood sample is taken from a vein in your arm.
- The test usually takes only a few minutes.
- Results are typically available within the same day.
Normal Range
- Normal: 70–99 mg/dL
- Prediabetes: 100–125 mg/dL
- Diabetes: 126 mg/dL or higher (confirmed by repeat testing)
Risks
- Mild bruising or soreness at puncture site
- Rare: dizziness or infection
FAQs
- Why is fasting important? It ensures that the test measures your baseline blood sugar without food influence.
- Can I drink coffee before the test? No, only water is allowed before the test.
Disclaimer
This page is for informational purposes only and should not replace medical consultation. Always follow your healthcare provider’s advice.