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    What is a Fasting Blood Sugar (FBS) Test?

    The Fasting Blood Sugar (FBS) test measures the blood glucose/sugar levels in a blood sample following a fasting period of 8 hours . The FBS is a fundamental test for the diagnosis and monitoring of prediabetes and diabetes. Diabetes is a condition associated with consistently elevated blood sugar levels due to the insufficient production or ineffective use of insulin hormone by the body. Prediabetes is a stage before diabetes, also known as borderline diabetes, where the blood sugar levels are slightly elevated but not high enough to be diagnosed as diabetes. The test is also done to check for gestational diabetes – diabetes that occurs in pregnant women due to the effect of pregnancy hormones.

    The FBS test provides a precise evaluation of how effectively the body regulates blood glucose levels in the absence of recent food intake. The test helps to evaluate and manage impaired glucose metabolism and diabetes in a person.

    Fasting Blood Sugar (FBS) Test Parameters

    Glucose, commonly referred to as blood sugar, is the main sugar present in the blood. The parameter measured in an FBS test is the blood sugar in a fasting state when the baseline sugar levels are most accurate.

    Elevated blood sugar levels can be a result of several factors, such as unhealthy dietary habits, sedentary lifestyle, obesity or excess body weight, and a family history of diabetes.

    Glucose is obtained from carbohydrates in the diet. During digestion, these carbohydrates are broken down and glucose is released into the bloodstream. Insulin – a hormone produced by the pancreas – enables the entry of glucose from the blood into the body’s cells where it is used for energy. As the cells absorb glucose, blood glucose levels decrease. Thus, sugar levels in the blood remain controlled. However, in an individual with diabetes, the pancreas does not make enough insulin or the body does not respond to insulin effectively, resulting in consistently elevated blood sugar levels. Over time, elevated sugar levels can damage the blood vessels and nerves and lead to serious health problems.

    Fasting Blood Sugar (FBS) Test Preparation

    Preparing for an FBS test requires adherence to specific guidelines to ensure accurate results. They are as stated below:


    It is imperative to not consume any food or drink, except water, for a minimum of 8-12 hours before the FBS test. Since food affects sugar levels, testing in a fasting state gives a more accurate picture of blood sugar levels.

    The best time to get tested

    The FBS test is usually scheduled in the morning before breakfast. This timing ensures that the individual has undergone overnight fasting for accurate test results.

    Who can do the FBS test

    Individuals with symptoms of diabetes (such as increased thirst, frequent urination, unexplained weight loss, and increased hunger) or who have risk factors for diabetes such as obesity or a family history of diabetes are eligible for the FBS test. Besides being a screening test to check for diabetes, the FBS test is done along with Postprandial Blood Sugar (PPBS) to monitor treatment efficacy in individuals with diabetes. The test is also done as part of routine health assessments to monitor blood glucose levels and to check for gestational diabetes in pregnant women.

    Cautions before taking the FBS test

    Before undergoing the FBS test, it is essential to inform your healthcare provider about any medications you have been taking. Certain medications can potentially influence blood sugar levels, thereby affecting the accuracy of the test results.

    Why Take a Fasting Blood Sugar (FBS) Test?

    An FBS test is recommended in the following instances:

    • Routine Monitoring

    The FBS test is ordered for routine monitoring of blood glucose levels, often during annual physical examinations, to track changes in blood glucose levels over time.

    • Screening During Pregnancy

    FBS testing is done between the 24th and 28th weeks of pregnancy to screen for gestational diabetes as a part of a Glucose Tolerance test to ensure that pregnancy hormones are not adversely affecting blood sugar levels.

    • Symptom Assessment and Risk Factor Evaluation

    Your healthcare provider may order the FBS test if you have symptoms of diabetes, such as increased thirst, frequent urination, blurred vision, fatigue, unexplained weight loss, numbness/tingling in the hands and feet, or sores that don’t heal. The test may also be ordered if you have risk factors for diabetes, such as obesity, high blood pressure, age 45 years or older, sedentary lifestyle, history of stroke or heart disease, or a history of gestational diabetes.

    • Monitoring of Prediabetes

    An FBS test may be ordered to monitor your sugar levels if you have previously had a glucose level that was higher than normal or are prediabetic. Regular FBS testing may be done to check if the recommended lifestyle changes reverse prediabetes and prevent diabetes.

    • Monitoring in Individuals with Diabetes

    Regular testing for FBS is essential to track blood sugar levels in those with diabetes. This helps assess treatment efficacy and adjust medication doses if needed.

    • Diagnosing Conditions Other Than Diabetes That Cause Low Glucose Levels

    The FBS test aids in identifying conditions other than diabetes that can cause hypoglycaemia (low blood sugar levels). These include liver diseases like viral hepatitis, liver cancer or cirrhosis; chronic kidney disease; and hormonal disorders such as reduced hormone production by the pituitary and adrenal glands. Diabetes medications and prolonged fasting can also cause low glucose levels.

    • Diagnosing Conditions Other Than Diabetes That Can Cause High Blood Glucose Levels

    The test can be used to diagnose conditions other than diabetes that can cause elevated blood glucose levels, like acromegaly, Cushing syndrome, hyperthyroidism, and pancreatic disorders.

    Fasting Blood Sugar (FBS) Test Results & Interpretation

    The results of the FBS test can be interpreted as per the table below:

    Fasting Blood Sugar Level Normal RangeInterpretation
    70 – 99 mg/dLNormal fasting blood sugar level
    100 – 125 mg/dLIndicates prediabetes; blood sugar levels are higher than normal but not high enough to classify as diabetes
    126 mg/dL or above, on more than one occasionIndicates high blood sugar, the main sign of diabetes

    Interpretation of Abnormal Results

    Low blood glucose levels, when blood sugar levels fall below 70mg/dL, may be due to an overdose of insulin, insulinomas (tumours in the pancreas that produce insulin), starvation, adrenal insufficiency, (underactive adrenal glands), drinking excessive alcohol, severe liver disease, hypopituitarism (underactive pituitary function), hypothyroidism (low thyroid function), and severe infections.

    High blood glucose levels most frequently indicate diabetes, but many other diseases and conditions can also cause elevated blood glucose, such as acromegaly (excess growth hormone), acute stress (response to trauma, heart attack, and stroke for instance), Cushing syndrome (excess cortisol hormone), hyperthyroidism (increased thyroid function), pancreatic cancer, and pancreatitis (inflammation of pancreas).

    FAQs on Fasting Blood Sugar (FBS) Test in Bangalore

    The FBS Test price is ₹ 180. This price includes the fastest home sample collection within 60 of booking, and the reports are available in 6 hours.

    The FBS test measures blood glucose levels after fasting and aids in the diagnosis and monitoring of conditions like prediabetes and diabetes.

    Yes, fasting for at least 8 to 12 hours is necessary before undergoing the Sugar test at home.

    Yes, Orange Health Labs offers home sample collection for the Sugar test at home in Bangalore, allowing you to get tested from the comfort of your home.

    Listed below are the steps to book any blood test or health checkup on our platform

    Search for the test: Look for the FBS Test in Bangalore or at home and click on Orange Health’s listing.

    Review and Book: Select the test, check the test prerequisites, enter your address, and confirm the booking after picking a suitable time slot for sample collection.

    Sample Collection: Our skilled eMedic will arrive within your chosen time slot to collect the sample at your home.

    Lab Processing: The collected sample will be sent to and examined at our NABL accredited and ICMR approved labs.

    Normal fasting blood sugar levels are typically between 70 and 99 mg/dL.

    FBS is a simple, quick test, which takes just a few minutes for sample collection. You can expect the results within 6 hours of sample collection.

    The frequency of testing depends on your doctor's recommendation and your health condition.

    The FBS test measures the amount of glucose in the blood after fasting for at least 8 hours.

    Fasting for at least 8 hours is required before the FBS blood test.

    Fasting ensures accurate measurement of baseline blood sugar levels without interference from recent food intake.

    Yes, drinking water is permitted before taking the FBS test.

    Hyperglycaemia refers to high blood sugar levels, often associated with diabetes and certain other health conditions.

    Symptoms of hyperglycaemia include increased thirst, increased hunger, frequent urination, fatigue, and blurred vision.

    The FBS test is typically performed in the morning after fasting overnight.

    Blood glucose tests are commonly used to diagnose and monitor diabetes and prediabetes. They are also used to diagnose other medical conditions that cause hyperglycaemia and hypoglycaemia.

    Unless your doctor or nurse gives you special instructions, you should keep taking your regular medications as usual before a Fasting Blood test.

    Without having to visit a physical lab, Orange Health provides the fastest FBS Test services near you across Bangalore at the convenience of your home. Localities include but not limited to Adugodi, Banashankari, Bannerghatta, Basavanagudi, Bellandur, BTM Layout, Chamrajpet, Cottonpet, CV Raman Nagar, Domlur, Electronic City, Frazer Town, Giri Nagar, Hebbal, Hennur, Hosur, HSR Layout, Jakkur, Jalahalli, Jaya Nagar, Kadugodi, Kammanahalli, Kengeri, Koramangala, Mahalakshmi Layout, Madiwala, Magadi Road, Malleshwaram, Marathahalli, Mathikere, Mysore Road, Nagarbhavi, Nandhini Layout, Old Airport Road, Peenya, RT Nagar, Rajaji Nagar, Rajarajeshwari Nagar, Sadashivnagar, Sahakara Nagar, Sanjay Nagar, Sarjapur, Seshadripuram, Shanthi Nagar, Shivaji Nagar, Sri Nagar, Tyagarajnagar, Uttarahalli, Vasanth Nagar, Vidyaranyapura, Vijaya Nagar, Whitefield, Yelahanka, Yeshwantpur.

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