Why FBS Testing Is Essential for the Early Detection of Diabetes?

An FBS test can not only help in detecting diabetes early and facilitating timely intervention but also help you monitor the progression of your condition once it has been diagnosed.


Diabetes is a widespread chronic condition characterised by elevated blood sugar levels over an extended period. It occurs when the body either produces insufficient insulin or fails to utilise insulin effectively. Prolonged high blood sugar can result in severe complications. Early detection of diabetes is essential as it enables timely and appropriate intervention. This can aid in preventing complications such as kidney damage, heart disease, and vision loss. Fasting blood sugar (FBS) tests play a vital role in the early detection of diabetes. So, read on to learn all about an FBS test and its importance.

What is an FBS Test?

 A fasting blood sugar test is a common and simple blood test used to screen for diabetes, gestational diabetes (during pregnancy), or prediabetes. It is also referred to as a fasting blood glucose test. Blood sugar, or glucose, is the primary sugar present in your bloodstream. When you consume food or beverages, your body breaks down the carbohydrates into sugar for energy. Subsequently, your pancreas produces a hormone known as insulin, which facilitates the entry of blood sugar into your body’s cells and stores excess blood sugar for later use.

As cells utilise the blood sugar, the levels of glucose and insulin in the blood decrease. However, individuals with diabetes experience difficulties in regulating glucose levels. This could be due to insufficient insulin production by the pancreas or ineffective insulin processing by the body. Consequently, the amount of sugar in the bloodstream exceeds normal levels, which can have adverse effects on the body. An FBS test measures your blood glucose levels when it is expected to be at its lowest, which is typically in the morning following an overnight fast.

Importance of FBB Testing for Early Diabetes Detection

 Many patients with diabetes remain asymptomatic or unaware of the underlying condition, often ignoring potential warning signs. Some may even already be experiencing diabetes-related complications at the time of diagnosis, such as adult blindness, end-stage renal disease, or cardiovascular diseases. Early identification of diabetes is crucial for preventing further complications. Given the ever-increasing prevalence of diabetes across various age groups and genders, coupled with the risk of prediabetes influenced by lifestyle factors, regular FBS testing can significantly impact your journey towards a healthier future.

When is an FBS Test Ordered?

 Prediabetes, gestational diabetes, and Type 2 diabetes often manifest no symptoms initially, making it possible for a person to have the condition without being aware of it. Healthcare providers typically request an FBS test in certain situations, such as:

  • As part of a routine annual health checkup to monitor your blood glucose levels over time.
  • When a person exhibits symptoms of diabetes, possesses risk factors like obesity, or has a family history of diabetes.
  • For pregnant women, to ensure that pregnancy hormones are not inducing diabetes.
  • Following a previous blood glucose level that was higher than normal.

FBS Test Results

 The results of the FBS test will be provided as a numerical value:

  • 99 mg/dL or lower: This indicates a normal fasting blood sugar level.
  • 100–125 mg/dL: Falling within this range typically suggests prediabetes, signifying that blood sugar levels are elevated but not yet at the level of diabetes.
  • 126 mg/dL or above: This signifies high blood sugar, which is a primary indicator of diabetes.

If your FBS level is high, your doctor may advise repeating the test for confirmation. In the case of prediabetes, it’s recommended to repeat the FBS test every one to two years. Monitoring the results will help determine if you are progressing towards Type 2 diabetes.

All in all, fasting blood sugar is a straightforward and commonly used blood test for diagnosing diabetes, prediabetes, or gestational diabetes. Prior to the test, it’s important not to consume any food or drink (except water) for 8-12 hours. Consult your healthcare provider to determine if an FBS test is necessary for you.