Fasting Blood Sugar

Fasting blood sugar (FBS) is a common diagnostic test that measures the concentration of glucose in the blood after a person has not eaten for 8 to 12 hours, typically overnight. It is used to evaluate how the body manages blood sugar levels and plays a crucial role in detecting prediabetes, type 1 and type 2 diabetes, and monitoring blood glucose in people already diagnosed with diabetes. Normal fasting blood sugar levels generally range from 70 to 99 mg/dL. Levels between 100 and 125 mg/dL may indicate prediabetes, while 126 mg/dL or higher on two separate tests usually confirms diabetes. This simple, yet important test is often part of routine health checkups.