Is home glucometer enough?

FBS

Fasting Blood Glucose

Overnight-fasted sugar — simple, widely available baseline.

Updated: 12 August 2026

Do not diagnose based on one lab value. Ranges vary by lab, method, age, pregnancy and medicines — always interpret trends with your doctor.

What the test measures

Blood glucose after 8–10 hours fasting.

Why doctors order it

Screen for diabetes
Track morning control
Pair with HbA1c

Preparation

8–10 hour fast (water allowed)
Avoid late-night sweets/alcohol before test

Normal range & abnormal meaning

Normal <100 mg/dL • Prediabetes 100–125 • Diabetes ≥126 (repeat to confirm).

High: insulin resistance or diabetes — correlate with HbA1c
Low: over-medication, missed meals or insulinoma (rare)

Limitations

Single-day value; stress/illness alters it
Needs confirmation — never diagnose on one reading

Questions to ask your doctor

Should I also do PP/HbA1c?
Do my medicines affect fasting values?

FAQs

Home meters track trends; lab values diagnose. Keep both — log home readings for your doctor.

References

ICMR Diabetes Guidelines — ICMR

Related diseases

Type 2 Diabetes Prediabetes Insulin Resistance

This website provides general educational information and is not a substitute for professional medical diagnosis, treatment or emergency care. Always consult a qualified healthcare professional.