
FBS/PPBS/RBS TEST
About FBS/PPBS/RBS:
The blood sugar fasting test (FBS test), the Postprandial Blood Sugar (PPBS) test, and the Random Blood Sugar (RBS) test are essential diagnostic tools to measure glucose levels in the blood. These tests help detect whether you have diabetes, pre-diabetes, or are at risk of developing diabetes in the future.
- The blood sugar fasting test measures glucose levels after 8–12 hours of fasting.
- The Postprandial Blood Sugar (PPBS) test measures blood sugar after eating, usually two hours after a meal.
- The Random Blood Sugar (RBS) test measures blood sugar at any time of the day, regardless of meals.
Diabetes is a chronic condition in which blood glucose remains consistently high, leading to complications such as heart disease, nerve damage, kidney failure, and vision problems. Doctors recommend regular blood sugar fasting test, PPBS test, and RBS test to screen, diagnose, and monitor diabetes.
At Lupin Diagnostics, patients can easily book blood sugar fasting test, book PPBS test online, or book RBS test online, with clear pricing information. Affordable blood sugar fasting test price, PPBS test price, and RBS test price make regular monitoring accessible.
Functions of Glucose
The blood sugar fasting test, PPBS test, and RBS test evaluate glucose levels, as glucose is the body’s primary energy source. Without adequate glucose supply, cells cannot function properly. High glucose levels can damage organs, while low glucose levels can cause fatigue and confusion.
By taking a blood sugar fasting test, Postprandial Blood Sugar (PPBS) test, or Random Blood Sugar (RBS) test, patients can ensure their glucose levels are in balance, reducing the risk of diabetes complications
What are the blood sugar tests used for?
The blood sugar fasting test, PPBS test, and RBS test are used for:
- Diagnosing diabetes and pre-diabetes.
- Monitoring diabetes progression.
- Evaluating response to diabetes treatment.
- Screening high-risk individuals.
Doctors recommend patients to book blood sugar fasting test, book PPBS test online, and book RBS test online as part of routine diabetes care.
Types of Blood Sugar Tests
Blood Sugar Fasting Test (FBS test)
The blood sugar fasting test measures blood glucose after 8–12 hours of fasting. This is the most accurate way to determine baseline sugar levels. Patients are instructed to avoid all food and beverages except water before the test. At Lupin Diagnostics, you can easily book blood sugar fasting test and check the blood sugar fasting test price in advance.
Postprandial Blood Sugar (PPBS) Test
The Postprandial Blood Sugar (PPBS) test measures blood sugar levels after a meal, usually two hours later. After food is digested, blood glucose levels rise, and insulin helps move sugar into cells. If blood sugar remains high after two hours, it may indicate diabetes. Patients can conveniently book PPBS test online at Lupin Diagnostics and know the PPBS test price before booking.
Random Blood Sugar (RBS) Test
The Random Blood Sugar (RBS) test measures blood sugar at any time of day, without the need for fasting. This test is useful for quick screening and diagnosis of diabetes. Patients can book RBS test online and check the RBS test price for convenience.
Symptoms of Diabetes

Feeling thirsty very often

Feeling hungry often

Fatigue

Urinating a lot

Losing weight without efforts

Numbing or tingling of hands and feet

Slow healing of any cuts or wounds

Having infections more than usual

Dry skin

Blurred vision
Who should get tested?

Age over 45 years

Prediabetes

Overweight or obese

Family history of diabetes

High cholesterol

High Blood Pressure

Heart diseases

Gestational diabetes

Poly Cystic Ovarian Syndrome
Test preparation:
- Blood Sugar Fasting Test (FBS test): Requires 8–12 hours of fasting. Only water is allowed.
- PPBS test: Taken 2 hours after a meal. No fasting required.
- RBS test: No preparation required. Can be done any time of the day.
At Lupin Diagnostics, patients can book blood sugar fasting test, book PPBS test online, or book RBS test online easily. Clear details about the blood sugar fasting test price, PPBS test price, and RBS test price are available before booking.
Interpretation of results:
Results |
Fasting blood sugar (mgdl) |
Post-prandial blood sugar (mg/dl) |
Random blood sugar (mg/dl) |
Normal |
70-100 |
140 and below |
N/A |
Pre-diabetes |
100-125 |
140-199 |
N/A |
Diabetes |
126 and above |
200 and above |
200 and above |
Abnormal values in a blood sugar fasting test, PPBS test, or RBS test may indicate diabetes or other conditions like thyroid disorders, pancreatic disease, or stress-related hyperglycemia. Patients can track progress and treatment response by repeating these tests regularly.
Deviations from normal levels indicates the following:
Your results may indicate you have diabetes or are at risk of developing it if they show higher than normal glucose levels. In addition, high glucose levels could indicate:
- Hyperthyroidism
- Pancreas disorders
- Stress following a surgery, a life-threatening illness, or trauma
If you have diabetes, your blood glucose levels may be lower than normal for a variety of reasons, including:
- Eating insufficiently, particularly after taking diabetes medication
- Exercising more frequently than usual
Low blood sugar levels without diabetes may indicate:
- Liver disease
- Kidney disease
- A hypoactive thyroid, pituitary, or adrenal gland (hypothyroidism)
- Addiction to alcohol (AUD)
A medical condition that requires treatment may not always be present if your glucose results are not normal. Stress and particular medications can both impact glucose levels. Speak with your healthcare provider to find out what your test results mean.
FAQs
Do I have pre-diabetes if my fasting blood sugar is 102 mg/dL?
Yes. According to diagnostic criteria, a blood sugar fasting test result between 100–125 mg/dL indicates pre-diabetes. Similarly, Postprandial Blood Sugar (PPBS) test or Random Blood Sugar (RBS) test values between 140–199 mg/dL also suggest pre-diabetes. Regular monitoring is advised. You can book blood sugar fasting test, book PPBS test online, or book RBS test online easily at Lupin Diagnostics.
Can I take a fasting blood sugar test if I ate 3 hours ago?
No. The blood sugar fasting test requires at least 8–12 hours of fasting. Eating before the test can lead to inaccurate results. To ensure accuracy, patients should properly prepare before scheduling. You can book blood sugar fasting test at Lupin Diagnostics and check the blood sugar fasting test price before booking.
How long should I fast before a fasting glucose blood test?
You must fast for at least 10 hours before the blood sugar fasting test. This ensures accurate results, as food can influence glucose levels. For convenience, you can book blood sugar fasting test at Lupin Diagnostics online.
Can I drink coffee before a fasting blood sugar test?
No. For the blood sugar fasting test, you should not consume coffee, tea, or milk. Only plain water is allowed. Patients can book blood sugar fasting test and follow clear preparation guidelines provided by Lupin Diagnostics.
What are the best foods to lower blood sugar levels?
A healthy diet helps manage diabetes. High-fiber foods, whole grains, vegetables, legumes, and lean proteins can lower blood sugar. Regular testing with the blood sugar fasting test, PPBS test, and RBS test helps track how food affects your glucose levels. Patients can book PPBS test online or book RBS test online to monitor post-meal and random blood sugar levels.
How much do blood sugar fasting test, PPBS test, and RBS test cost?
The blood sugar fasting test price, PPBS test price, and RBS test price at Lupin Diagnostics are affordable and transparent. Patients can check exact prices online before booking. You can easily book blood sugar fasting test, book PPBS test online, or book RBS test online depending on your doctor’s recommendation.