To ask about timing or book a home visit, call 8872524007.
What the Fasting Blood Sugar test checks
FBS (also written FPG, fasting plasma glucose) shows how well your body keeps glucose in check overnight, when no new food is coming in. During that time the liver releases stored glucose and insulin holds the level steady. If insulin is short or isn't working well, the morning value creeps up.
It is a single snapshot of one moment. That's why doctors often pair it with an HbA1c test, which reflects the past two to three months.
Why your doctor may order it
- Routine screening, often yearly after age 30 or earlier with a family history, weight gain or high blood pressure
- Symptoms like constant thirst, passing urine at night or slow-healing cuts
- Follow-up when diabetes or prediabetes is already known
- Before surgery, or as part of a general health check
Many people simply ask us for a "sugar test" or a "diabetes test". In most cases the doctor means this fasting reading, sometimes together with the PPBS test.
How to prepare
Stop eating 8 to 10 hours before your sample, so dinner by about 9:30 pm works for a 7:30 am visit. Don't fast much longer than 12 hours, as that can skew the result too.
Plain water is allowed and helps the draw. Tea, coffee, milk, juice, gutkha, chewing gum and a morning cigarette all count as breaking the fast. If you take tablets or insulin for diabetes, ask your doctor whether to take the morning dose before or after the test. Our blood test preparation guide covers the general rules.
Sample type and report time
A small venous sample is drawn from the arm into a grey-top tube. The fluoride in it stops blood cells using up the glucose while the sample waits, which keeps the reading accurate.
The report is usually ready the same day if the sample reaches us by about 11 am. You get a printed copy at the lab and a PDF on WhatsApp. If you're searching for a fasting blood sugar test near me in Banur or the nearby villages, we can also collect at home; see home sample collection.
Understanding your results
The American Diabetes Association (ADA) uses these fasting plasma glucose cut-offs:
- Below 100 mg/dL: usual fasting range
- 100 to 125 mg/dL: prediabetes (impaired fasting glucose)
- 126 mg/dL or above: consistent with diabetes, normally confirmed by a repeat test or HbA1c
A value below about 70 mg/dL is low and can come with sweating, shakiness or dizziness. Illness, stress, steroids and a broken fast can all push the number up. The range printed on your report is the one that applies, as ranges vary by lab and method. Your doctor reads the result alongside your symptoms and other tests.
FAQ
Can I drink water before a fasting sugar test?
Yes. Plain water is fine and makes the draw easier. Anything with milk, sugar or caffeine is not.
What happens if I accidentally ate something?
Tell us at the counter. We'd usually suggest coming back another morning, or your doctor may switch to a random sugar or HbA1c instead.
Is one high fasting reading enough to say I have diabetes?
Usually not. Unless there are clear symptoms, a high value is normally confirmed with a repeat test or HbA1c before any diagnosis.
How long do I need to fast?
8 to 10 hours is the usual window. Overnight fasting from dinner to an early-morning sample works well for most people.
Book at Alpha Laboratory
Book your fasting blood sugar test by calling 8872524007, or WhatsApp us a photo of the prescription. We're at Municipal Committee, M.C. Road, Banur; find directions on the contact page.