what is the fasting blood sugar

Fasting blood sugar (FBS) refers to the level of glucose in your blood after you have not eaten for at least 8 hours. It is commonly used to diagnose prediabetes and diabetes. Here are the typical ranges:

• Normal: Less than 100 mg/dL
• Prediabetes: 100 to 125 mg/dL
• Diabetes: 126 mg/dL or higher on two separate tests

Fasting blood sugar tests are often done in the morning before breakfast. If your levels are high, your doctor may recommend further testing or lifestyle changes to manage your blood sugar.