Blood Glucose Fasting (FBS) Test: Booking, Price, and Results
About Blood Glucose Fasting (FBS) Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | Fasting Plasma Glucose (FPG) Test, Fasting Blood Sugar (FBS) Test, Fasting Blood Glucose (FBG) Test |
| Sample Type | Venous blood |
| Fasting Required | Yes, avoid all food and drinks except plain water for 10 to 12 hours before the test |
| Report Time | Same day |
| Recommended For | All adults, especially those aged 35 and above; males and females; individuals with diabetes risk factors |
| Price | Starting at ₹60 |
What Is a Blood Glucose Fasting (FBS) Test?
The blood glucose fasting (FBS) test measures the level of sugar (glucose) in your blood after you have not eaten for at least 10 to 12 hours. It gives a clear picture of how well your body manages blood sugar without the influence of a recent meal. Doctors commonly prescribe it to screen for diabetes, prediabetes, and related conditions. This test is also known as the fasting plasma glucose (FPG) test, fasting blood sugar (FBS) test or the fasting blood glucose (FBG) test, and it uses a small blood sample drawn from a vein in your arm.
What Does a Blood Glucose Fasting (FBS) Test Measure?
The test measures the concentration of glucose in your blood after you have fasted for at least 10 to 12 hours. During a fast, your body is not receiving sugar from food, so the result reflects your baseline blood sugar regulation.
The table below explains what the test looks at:
| Parameter | What It Tells You |
|---|---|
| Fasting Plasma Glucose | How well your body controls blood sugar in the absence of recent food intake |
Glucose is the body's primary energy source, derived from the carbohydrates you eat. When blood glucose is consistently too high or too low, it can point to underlying health conditions that need attention.
Why Is a Blood Glucose Fasting (FBS) Test Done?
Doctors order the fasting blood glucose (FBG) test for several reasons, including routine screening, symptom investigation, and ongoing disease management.
Common Symptoms That May Require This Test
Your doctor may recommend this test if you are experiencing any of the following symptoms:
- Increased thirst and more frequent urination than usual
- Persistent fatigue and low energy
- Blurred vision
- Slow-healing wounds or frequent infections
- Numbness or tingling in the hands or feet
- Unexplained weight loss
- Extreme or sudden hunger
Conditions This Test Can Help Detect
The FBS test can help identify a range of conditions. These include:
- Prediabetes (blood sugar higher than normal but below the diabetes threshold)
- Type 1 diabetes
- Type 2 diabetes
- Gestational diabetes (diabetes that develops during pregnancy)
- Hyperthyroidism (overactive thyroid gland)
- Pancreatic problems
- Liver disease or adrenal insufficiency (when fasting glucose is unusually low)
Blood Glucose Fasting (FBS) Test During Pregnancy
Blood glucose screening is recommended for all pregnant individuals between 24 and 28 weeks of gestation. During this period, a fasting blood sugar (FBS) test is often part of a broader oral glucose tolerance test (OGTT), which involves a fasting blood draw, consumption of a glucose drink, and a follow-up blood test two hours later. Early identification of gestational diabetes helps ensure appropriate care for both mother and baby.
Blood Glucose Fasting (FBS) Test for Chronic Disease Monitoring
For people already diagnosed with diabetes, regular fasting plasma glucose (FPG) testing is an important part of ongoing care. The test helps track how well a treatment plan is working and whether blood sugar levels are staying within a target range. Consistent monitoring allows doctors to make timely adjustments to medicines or lifestyle recommendations.
How to Prepare and What to Expect
Preparing correctly for your blood glucose fasting (FBS) test ensures the most accurate result.
Do You Need to Fast?
Yes. You must avoid all food and drinks except plain water for at least 10 to 12 hours before the test. Ideally, schedule your appointment for the morning so the fasting period coincides with your overnight sleep. If your doctor has ordered additional tests alongside this one, some of those may also require fasting. Confirm specific requirements with your doctor or the laboratory when booking.
Practical Tips Before Your Test
These steps will help you get reliable results:
- Drink plain water during the fasting period to stay hydrated
- Get adequate sleep the night before
- Inform your doctor about all medications you are taking, as some can affect glucose levels
- Wear a short-sleeved or loose-sleeved top for easy access to your arm
- Avoid strenuous exercise immediately before the test
Step-by-Step Procedure
Here is what to expect on the day of your blood collection:
- You will be seated comfortably. A trained phlebotomist (blood collection specialist) will check your arm for a suitable vein.
- The area will be cleaned and disinfected before the needle is inserted.
- A small needle is used to draw a blood sample into a test tube or vial. The process takes less than a minute.
- You may feel a brief sting as the needle enters. This is normal and passes quickly.
- Once the sample is collected, a small bandage is placed on the site.
- The sample is labelled and sent to the laboratory for analysis.
Factors That Can Affect Accuracy
Several factors may influence your results. Inform your doctor if any of these apply to you:
- Inadequate fasting (eating or drinking anything other than water before the test)
- Stress or recent illness
- Certain medications, particularly steroids and thiazide diuretics
- Dehydration
- Poor sleep the night before the test
- Natural early-morning hormone fluctuations (known as the dawn phenomenon)
Understanding Your Blood Glucose Fasting (FBS) Test Results
| Result Category | Glucose Level (mg/dL) |
|---|---|
| Normal | Below 100 mg/dL |
| Prediabetes | 100 to 125 mg/dL |
| Diabetes | 126 mg/dL or above |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Certain conditions and circumstances can shift your fasting glucose reading:
- Stress hormones such as cortisol and epinephrine naturally raise blood sugar during early morning hours, a pattern called the dawn phenomenon. High levels of ongoing stress or social isolation have also been linked to elevated fasting glucose.
- Steroid medications (such as prednisone) can cause a notable rise in blood sugar by making the liver less responsive to insulin. If you take steroids or thiazide diuretics, discuss this with your doctor before testing.
- In conditions such as sickle cell disease, pregnancy, kidney dialysis, or blood transfusion, a standard glucose measurement is preferred over HbA1c as the more reliable indicator of blood sugar.
How to Maintain Healthy Levels
These general wellness habits can support normal blood sugar levels:
- Eat a balanced diet with plenty of fibre and fewer refined carbohydrates and sugary foods
- Aim for at least 30 minutes of moderate physical activity on most days
- Manage stress through adequate sleep, relaxation, and regular routines
Lupin Diagnostics Blood Glucose Fasting (FBS) Test Price and Home Collection
The fasting blood glucose (FBS) test starts from approximately ₹24, with home sample collection available across cities in India through Lupin Diagnostics.
Price by City
| City | Approximate Price (₹) |
|---|---|
| Bengaluru | ₹75 |
| Hyderabad | ₹70 |
| Mumbai | ₹85 |
| Chennai | ₹60 |
| Kolkata | ₹85 |
| Pune | ₹70 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot via the online booking page.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
Lupin Diagnostics offers home sample collection for the fasting blood glucose (FBS/FBG) test across multiple cities in India. A trained phlebotomist collects the blood sample at your doorstep, and it is processed in NABL-accredited laboratories. Digital reports are delivered via email or WhatsApp, making it easy to share results with your doctor.
Frequently Asked Questions
Food raises your blood sugar, so eating before the test would distort your baseline reading. Fasting for 10 to 12 hours removes the effect of recent meals, giving a more accurate picture of how your body manages glucose on its own.
You should avoid all food and drinks except plain water for at least 10 to 12 hours before the blood glucose fasting (FBS) test. Scheduling your appointment in the morning makes this easier to manage.
A fasting plasma glucose (FPG) test result between 100 and 125 mg/dL is classified as prediabetes. This means blood sugar is higher than normal but has not yet reached the threshold for a diabetes diagnosis. Your doctor can advise on next steps.
Yes, it can. Higher stress levels are associated with raised fasting glucose, as stress hormones prompt the body to release more sugar into the bloodstream. If you were under significant stress before your test, let your doctor know when discussing your results.
Adults aged 35 and above are generally advised to get screened regularly, even without symptoms. If you have risk factors such as a family history of diabetes, obesity, or high blood pressure, your doctor may recommend testing at an earlier age or more frequently. People already diagnosed with diabetes may need tests more often.
Yes. Steroids, thiazide diuretics, and certain other medicines can raise or lower blood glucose readings. Always inform your doctor about any medications or supplements you are taking before your FBS test so that results are interpreted in the correct context.
Blood Glucose Fasting (FBS) Test: Booking, Price, and Results
