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Fasting Blood Sugar (FBS) Test

A fasting blood sugar test analyses the sugar (glucose) content in your blood. It is a very simple, safe, and common way to diagnose prediabetes, diabetes, or gestational diabetes.

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What is Fasting Blood Sugar (FBS)? 

The Fasting Blood Sugar Test analyses your fasting blood glucose levels. You have to fast for 8 to 10 hours before your blood test. You should not eat or drink anything (except water). This test has been used to screen for prediabetes and diabetes and check the effectiveness of medications or dietary changes for people diagnosed with diabetes.


What are the other names for the Fasting Blood Sugar (FBS) test? 

The other names are glucose fasting blood and FBS. 

What are the test parameters included in the Fasting Blood Sugar (FBS) test?

There is only one parameter: fasting blood sugar.

What does a Fasting Blood Sugar (FBS) test measure?

This FBS test measures the amount of glucose in your blood after you have gone without eating or drinking anything but water for at least 8 hours. This test is performed only in the morning. 


Glucose is the main energy source for the body. Carbohydrates consumed in the diet are broken down in the body into glucose, which is absorbed by the intestines and transported by the blood to various parts of the organs. The cells of these organs utilize glucose to produce the energy when it is required, and the excess is then stored either as glycogen in the liver for short-term storage or in fat tissues as triglycerides for long-term storage. The uptake, utilisation, and storage of the glucose after it has been absorbed in the intestines is facilitated by the hormone insulin, which is secreted by the pancreas. This insulin influences the transport of glucose to the organs like the heart, brain, working muscles, etc. It also directs the storage of excess glucose in the liver. This action of insulin will reduce sugar levels in the blood.

After a meal, sugar levels increase in the blood, and insulin is secreted in response to reducing sugar levels until they become normal. If the glucose levels fall too low in the blood, another pancreatic hormone called glucagon is released, which directs the liver to convert the stored glycogen into glucose and release it into the bloodstream. Insulin and glucagon hormones create a feedback mechanisms to keep the blood glucose levels within the normal range. An imbalance in their activities causes an excess or shortage of blood sugar.


The Glucose-Fasting blood test helps to evaluate if the body is able to utilise or store glucose efficiently. High levels of sugar in the blood indicate diabetes or resistance to insulin. This type 1 diabetes occurs when insulin is not produced or produced in a very small quantity. Type 2 diabetes is caused when insulin is produced but not utilised effectively by the body. In both these cases, blood sugar levels rise while cells are deprived of nutrition.


What’s the normal range? 

70-110 mg/dL

Who should get a Fasting Blood Sugar (FBS) test? 

Your doctor may include glucose testing in a panel of tests for a background check of your health information, such as during an annual examination. Your doctor might also want to screen you for elevated glucose if you are at a higher than the average risk of developing diabetes. Risk factors for diabetes include:

  • Being 45 years of age or older

  • Being overweight or obese

  • If you have heart disease, high blood pressure, or high cholesterol.

  • Prediabetes

  • Having family members with diabetes

  • A lack of physical activity

  • Polycystic ovarian syndrome

In case you are pregnant, your doctor may recommend glucose testing to screen for gestational diabetes, a type of diabetes that is linked to hormone changes during pregnancy. Having gestational diabetes can be very harmful to the mother and the foetus if it is left untreated and can increase the risk of developing diabetes later in life.


Your doctor may also order glucose testing if you are experiencing symptoms of diabetes, including:

  • Frequent urination

  • Excessive hunger or thirst

  • Tingling or a loss of sensing the feel in the hands or a feet

  • Blurred vision

  • An abnormal number of infections

  • Unexplained weight loss

  • I feel very tired.

  • Skin that is dry

  • Sores that don’t heal quickly

Additionally, the doctor may order glucose testing if you have any symptoms of low blood sugar or any other health condition. Glucose testing is also a very important part of managing prediabetes and diabetes after they have been diagnosed.

Are preparations needed for the Fasting Blood Sugar (FBS) test?

Fasting is required. Do not eat or drink anything other than water for 8–12 hours before the test.

What is the cost of a Fasting Blood Sugar (FBS) test?

What is the type of sample required? 

This test requires a blood sample.

Who performs a Fasting Blood Sugar (FBS) test?

A healthcare provider, who is also called a phlebotomist, usually performs blood draws, including those for fasting blood sugar tests, but any healthcare provider trained in drawing blood can perform this task. Usually, the samples are sent to a lab where a medical laboratory scientist prepares the samples and performs the tests on analysers or manually.


What should I expect during my Fasting Blood Sugar (FBS) test?

You can expect to experience the following during the blood test or a blood draw:

  • You will have to sit comfortably on the chair, and a healthcare provider will check your arms for an easily accessible vein. It is the inner part of your arm on the other side of your elbow.

  • Once they have located a vein, they will clean and disinfect the area with an alcohol swab.

  • Then they will insert a small needle into your vein to draw a blood sample. This might feel like a small pinch.

  • After they insert the needle, the required amount of blood will be collected in a test tube.

  • When they have collected enough blood for the test, they’ll remove the needle and hold a cotton ball or gauze on the site to stop any bleeding.

  • They will put a band-aid over the pricked site, and the blood collection is finished.

This process takes less than five minutes.

What should I expect after my Fasting Blood Sugar (FBS) test?

Once the healthcare provider has collected the blood sample, it will be sent to the laboratory for processing or testing. When the results are ready, your healthcare provider will share the results with you.

What are the risks of a Fasting Blood Sugar (FBS) test?

These blood tests are very common and don’t carry any significant risks. You may have a  slight pain like an ant bite when the needle gets inserted, and a small bruise may develop there.

When can I expect my Fasting Blood Sugar (FBS) test results?

These reports are available via email or WhatsApp within 6 hours of the collection of the blood sample.

What do the results of a Fasting Blood Sugar (FBS) test mean?

If the FBS test results are at the borderline or elevated and it indicates diabetes, then these tests need to be repeated a second time in the near future or other tests may be recommended or performed, such as the haemoglobin A1C test, oral glucose tolerance test, or the postprandial plasma glucose test.

The results may vary from lab to lab—or even in the same lab—from day to day. As a result, the two abnormal results from tests taken on the two different days are required to confirm a diagnosis.

The results may be lower if the blood is drawn in the afternoon rather than in the morning. A glucose level can sometimes be falsely low if too much time passed between when the blood is drawn and the lab processes the sample. The results can also be affected by previous or current medical conditions or by personal habits such as smoking and exercise.

Abnormal test results may also indicate diabetes. A healthcare professional or a doctor should consider a person’s full medical history when conducting this test and interpreting the results. Keep in mind that the blood test is used not only to diagnose diabetes but also to prevent it. The higher values are likely to reflect diet and lifestyle issues as well as poor insulin functioning.

What are normal Fasting Blood Sugar (FBS) test results?

70-110 mg/dL


What other tests might I have along with this test?

PPBS and HBA1c.

How do I book a Fasting Blood Sugar (FBS) test at home?

Log on to and submit your details. Our highly trained, professional, and vaccinated eMedics will be at your doorstep within 60 minutes or at the time booked by you.


FAQs on FBS Test

What should your blood sugar be during the morning fasting?

For a person who is non-diabetic, fasting blood sugar levels are generally between 70 to 100 mg/dL depending on the time of day and the last time they ate dinner.

Is a fasting sugar of 110 normal?

Fasting blood sugar values of 110 are on the higher side of normal. However, fasting blood sugar alone is not sufficient to diagnose prediabetes or diabetes.

What is the normal range for blood sugar?

A normal blood sugar value is less than 140 mg/dL. A value of more than 200 mg/dL after two hours indicates diabetes. Values between 140 - 199 mg/dL indicate prediabetes. 

What should a 12-hour fasting blood sugar be?

A fasting blood sugar value if less than 100 mg/dL is considered normal. A fasting sugar of 100 to 125 mg/dL is considered prediabetes. If it is 126 mg/dL or higher in two separate tests, it is considered diabetes.


What are the warning signs of prediabetes?

Prediabetes does not usually show any signs or symptoms. One of the possible signs of prediabetes is darkened skin on certain parts of the body. The affected areas may include the neck, armpits, and groin.

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