Glucose (Fasting)
Test code: BCM0273
- Sample
- Blood
- Preparation
- 8 hr fasting
- Report
- Within 3 Hours
- Processed
- Mon to Sun, by 06:00 PM
About this test
The Fasting Blood Glucose test measures the sugar level in your blood after an overnight fast. It is one of the basic tests used to screen for and diagnose diabetes and prediabetes, and to monitor blood sugar control.
Preparation & sample
Minimum 8 hours fasting is mandatory (8 to 12 hours is ideal). Drink only plain water; avoid tea, coffee, juice, chewing gum and smoking during this time. If you take diabetes medicines or insulin, ask your doctor whether to take your morning dose before or after the test, and carry a snack to eat after your sample is collected.
What does this test measure?
It measures the amount of glucose (sugar) in your blood when you have not eaten for at least 8 hours. This shows how well your body controls sugar without the effect of a recent meal.
When should you get this test?
- As part of a routine health check-up, especially after age 30
- If you have excessive thirst, frequent urination, tiredness or blurred vision
- If you are overweight, inactive, or have a family history of diabetes
- If you have high blood pressure, high cholesterol or had diabetes in pregnancy
- To monitor diabetes or prediabetes
Understanding your results
Widely used guidelines classify fasting blood glucose (mg/dL) as follows:
| Fasting glucose | What it means |
|---|---|
| Below 100 | Normal |
| 100 to 125 | Prediabetes (impaired fasting glucose) |
| 126 or above | Diabetes, usually confirmed by a repeat test |
Illness, stress, poor sleep and some medicines (such as steroids) can raise sugar levels for a short time. Doctors often check HbA1c or a post-meal (PP) sugar test as well to get a complete picture.
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