Glucose (FBS/RBS)

About This Test
Glucose (FBS/RBS) measures the sugar level in your blood to screen for and monitor diabetes. FBS (Fasting Blood Sugar) is taken after 8–10 hours without food for a baseline reading, while RBS (Random Blood Sugar) can be checked anytime to assess current levels; results are interpreted with symptoms and, when needed, HbA1c or an oral glucose test.

Patient Preparation
Fasting for 8–10 hours before the test, minimal water only

Best Time to Test
Morning

Tests Included
Glucose (FBS/RBS)

Why is it done
Diagnosing diabetes or prediabetes.
Checking unexplained thirst, frequent urination, or fatigue.
Monitoring long‑term sugar control in diabetes.
Assessing treatment adjustments.
Often included in routine check‑ups to find issues early.