Blood Sugar — Fasting (FBS)

What this test checks

This is your blood-sugar reading after at least 8 hours without eating. A healthy person's body keeps overnight sugar in a tight range; a number above the normal range suggests your body is having trouble managing sugar.

Why do people get this test?

Fasting blood sugar is the simplest and cheapest way to screen for diabetes or pre-diabetes. It is almost always paired with the after-meal (PP) test for a fuller picture, and is a part of most general health check-ups in Nepal.

When you should consider this test

• Routine health screen, especially over age 35
• Family history of diabetes
• Frequent thirst, hunger, or urination
• Unexplained weight loss or fatigue
• Already known to be pre-diabetic — to track progress

How to prepare

Fast for 8 to 12 hours before the test. Only plain water is allowed. If you take medicines, ask your doctor whether to take them before the test.