Quick answer
The Fasting & Post Lunch Blood Sugar Test (FBS + PLBS) costs ₹150 at Live Line Health Care. Two sugar readings on one day, one after an overnight fast and one 2 hours after a meal. 8–10 hours fasting for the first sample, then a normal meal and a second sample exactly 2 hours after the first bite.
Also known as: FBS and PLBS, FBS PLBS, FBS PPBS, Fasting and PP Sugar, Fasting and Post Prandial Blood Sugar, Sugar Fasting and PP, F and PP Sugar
What is the Fasting & Post Lunch Sugar Test?
The Fasting and Post Lunch Blood Sugar test gives you two glucose readings on the same day. The first sample is taken in the morning after an overnight fast of 8 to 10 hours. You then eat a normal meal, and the second sample is taken exactly 2 hours after your first bite. Booking them together costs less than two separate tests and gives your doctor a matched pair from one day, which is easier to read than numbers taken weeks apart.
The two values answer different questions. Fasting sugar shows the level your body holds overnight, which depends mainly on how much sugar the liver releases. Post lunch sugar shows how quickly your body clears the sugar from a meal. Some people have a normal fasting value but a high post meal value, and others the reverse, so seeing both helps. Doctors in India often ask for this pair when following up diabetes. HbA1c gives the 3 month average and is the better test for diagnosis, while this pair shows daily patterns. If you only need one reading, the fasting or post lunch test can be booked alone.
What it measures: Plasma glucose after an overnight fast, and again 2 hours after the start of a normal meal.
Parameters included (2)
- Fasting Plasma Glucose (mg/dL)
- Post Prandial Plasma Glucose, 2 hours (mg/dL)
Why is this test done?
- Regular follow-up of diabetes control with both readings on one day
- Seeing whether high sugar happens overnight, after meals, or both
- Adjusting diabetes medicines and meal plans
- Screening adults with risk factors such as obesity or family history
- Following up a borderline fasting sugar or HbA1c result
When should you get tested?
- Known diabetes, with a routine review coming up
- Thirst, frequent urination or tiredness
- Weight gain around the waist or a family history of diabetes
- A raised HbA1c without a clear daily pattern
- A past history of diabetes in pregnancy
How to prepare for the Fasting & Post Lunch Sugar Test
- 1Fast for 8 to 10 hours overnight. Only plain water is allowed before the first sample.
- 2After the fasting sample, eat your usual breakfast or lunch and note the time of the first bite.
- 3Give the second sample exactly 2 hours later, and avoid snacks, sweets or sugary tea in between.
- 4Ask your doctor whether to take your morning diabetes medicine before or after the fasting sample. Do not skip it without advice.
- 5Plan your morning so you can be ready for the second sample on time, whether at a centre or at home.
Fasting & Post Lunch Sugar Test normal range
| Parameter | Typical reference range |
|---|---|
| Fasting, normal | 70–99 mg/dL |
| Fasting, prediabetes | 100–125 mg/dL |
| Fasting, diabetes | 126 mg/dL or higherconfirmed on repeat testing |
| Post lunch (2 hours), normal | Below 140 mg/dL |
| Post lunch (2 hours), higher than normal | 140–199 mg/dL |
| Post lunch (2 hours), suggests diabetes | 200 mg/dL or higherneeds confirmation |
For people already treated for diabetes, doctors commonly aim for a fasting value of 80–130 mg/dL and a post meal value below 180 mg/dL, but your own target may differ. Ranges are typical adult values and vary between labs, age and sex. Always use the range printed on your report and discuss results with your doctor.
Understanding your results
- Both values normal means your body handled the overnight fast and the meal well on that day.
- A high fasting value with a normal post lunch value usually points to sugar released by the liver overnight, and your doctor may adjust evening or bedtime medicines.
- A normal fasting value with a high post lunch value suggests trouble clearing sugar after meals, which is common in early diabetes.
- Both values high usually means overall control needs review, and your doctor may also check HbA1c.
- A post lunch value lower than the fasting value usually means a light meal or a mistimed sample, and the test may need repeating.
Fasting & Post Lunch Sugar Test – FAQs
What is the price of the Fasting & Post Lunch Sugar Test?
The Fasting & Post Lunch Blood Sugar Test (FBS + PLBS) costs ₹150 at Live Line Health Care, at all 45 centres and for home sample collection.
Why test fasting and post lunch sugar together?
Because they reveal different problems. Fasting sugar reflects overnight control and post lunch sugar shows your response to food. Testing both on the same day gives your doctor a matched pair, which helps when adjusting medicines or diet. It also costs less than booking the two separately.
What should I eat between the fasting and post lunch samples?
Eat your normal breakfast or lunch, the kind of meal you usually have. Do not eat less to get a better number, and do not eat extra. The aim is to see how your body handles everyday food. Avoid snacks and sweet drinks until the second sample.
Can I take my diabetes medicine before the fasting sample?
Ask your doctor. Many people are told to give the fasting sample first, then take their medicines with the meal. Do not skip insulin or tablets without advice, as that can make the readings misleading or unsafe. Bring your medicines with you if you are coming to a centre.
Is this test enough to diagnose diabetes?
A fasting value of 126 mg/dL or more on two occasions can diagnose diabetes. The post lunch value supports the picture but is not a formal diagnostic test, because meals vary. Your doctor will often add HbA1c, or a glucose tolerance test, to confirm.
How is this different from the glucose tolerance test?
This test uses your normal meal, so it reflects daily life. The glucose tolerance test uses a standard 75 g glucose drink and is done at a centre under controlled conditions, which makes it the formal test for diagnosing diabetes and diabetes in pregnancy. Your doctor will choose the one you need.
What if I miss the exact 2 hour time?
Tell the staff the actual time you started eating. A few minutes either way matters little, but a delay of half an hour or more can lower the reading and make it unreliable. If timing went badly wrong, your doctor may suggest repeating the post lunch sample another day.
Where can I get the Fasting & Post Lunch Sugar Test done?
At any of our 45 Live Line Health Care centres in 40 cities across Andhra Pradesh and Telangana, including Hyderabad, Visakhapatnam, Warangal, Kakinada and Nellore, or book home sample collection.
Medical disclaimer: This information is for general awareness only and is not a substitute for professional medical advice. Please consult a qualified doctor to interpret your results and before starting or changing any treatment.