Screening Test For DIABETIES: Glucose Fasting Test

What Is Fasting Blood Sugar?

Fasting blood sugar is a simple, common blood test to screen for diabetes, prediabetes, or gestational diabetes (during pregnancy). It’s also called a fasting blood glucose test.

When Does A Person Need To Have Their Blood Glucose Measured With This Test?

Prediabetes, Type 2 diabetes, and gestational diabetes often have no symptoms at first. A person can have the condition and not know it. Healthcare providers usually order a fasting blood sugar test:

• As part of a standard annual physical examination to monitor a person’s blood glucose over time.
• For pregnant women to ensure that pregnancy hormones are not causing diabetes.
• When a person has symptoms of diabetes, a family history of diabetes, or risk factors for diabetes (such as obesity).
• When a person has had a previous blood glucose level that was higher than normal.

How Does Blood Glucose Work?

Blood sugar, or glucose, is the main sugar found in your blood. When you eat or drink, your body breaks down carbohydrates in the food or liquid into sugar for energy.

Then your pancreas produces a hormone called insulin, which helps blood sugar enter your body’s cells.

It also helps your body store blood sugar for later use. As the cells use the blood sugar, glucose and insulin levels in the blood decrease.

But with diabetes, your body has trouble regulating glucose. Either your pancreas doesn’t make enough insulin, or your body doesn’t process insulin effectively. Therefore, the amount of sugar in your blood is higher than normal. And a lot of glucose in your blood is bad for your body.

A fasting blood glucose test measures the amount of glucose in your blood when it should be at its lowest. That happens in the morning and when you haven’t had anything to eat or drink for a while.

Are There Any Risks With A Fasting Blood Sugar Test?

A blood test is a very common and safe test, with almost no chance of any complications.

When Will I Get The Results Of The Test?

Results of a fasting blood glucose test are usually available quickly, within days or hours.

What Is Normal Fasting Blood Sugar, And What Is A Diabetes Blood Sugar Level?

The results of the fasting blood sugar test will come back as a number:

• 99 mg/dL or lower: This is a normal fasting blood sugar level.
• 100–125 mg/dL: Fasting blood sugar in this range typically indicates prediabetes. This means your blood sugar levels are higher than normal but not high enough to be classified as diabetes.
• 126 mg/dL or above: This indicates high blood sugar, the main sign of diabetes.

If you have a high fasting blood sugar level, your healthcare provider may repeat the test to make sure. If the test reveals that you have prediabetes, your healthcare provider will recommend you repeat the fasting blood sugar test every year or two. The results will help you know whether you are progressing to Type 2 diabetes.