ClarilabDiabetes
Fasting glucose test
Also called FBS, fasting blood sugar, FPG
Blood sugar after not eating for at least 8 hours.
- Typical range
- 70–99 mg/dL.
- Preparation
- Fast 8–12 hours; water is fine.
- Usual recheck
- About 3 months when out of range
Why it's done
Screens for diabetes and prediabetes; used to monitor treatment.
What a high result can mean
100–125 mg/dL suggests prediabetes; 126 or more on two tests suggests diabetes.
What a low result can mean
Below 70 mg/dL is low sugar (hypoglycaemia), usually from diabetes medicines or a missed meal.
Got a report with Fasting glucose?
Upload the PDF to Clarilab: it reads the values in your browser, flags anything out of range and tracks your results over time.