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Biochemistry Diabetes Home collection available

Glucose Tolerance Test (GTT)

Parameters1 tested
SampleBlood
Fasting10-12 hrs
Report inSame day

How to prepare

Fasting needed

Do not eat for 10-12 hrs before the test. Plain water is fine.

Good to know

Fast for 10–12 hours before the test (only water allowed). Take your usual medicines unless your doctor says otherwise.

Medicines

Tell our phlebotomist about any medicines you take. Don't stop them without asking your doctor.

Comfortable clothes

Wear a loose sleeve so the sample can be taken easily from your arm.

How it works

Book onlinePick a time slot
Home visitSealed, sterile kit
Lab testingBarcode tracked
ReportIn same day

About this test

GTT measures how your body handles a glucose drink over 2 hours. It is used to diagnose diabetes in pregnancy and borderline cases.

Why is this test done?

  • Diabetes in pregnancy (24–28 weeks)
  • Borderline sugar results

Symptoms — when should you get tested?

  • Pregnancy
  • Family history of diabetes
  • Borderline fasting sugar

Normal range

Fasting < 95 mg/dL
1 hour < 180 mg/dL
2 hours < 140 mg/dL

Reference ranges differ slightly between labs, methods, age and sex. Always discuss your report with your doctor.

If your result is high

High values mean gestational diabetes or diabetes.

Common reasons
  • Gestational diabetes
  • Diabetes or prediabetes

How is the test done?

  1. 1
    Book online

    Choose your slot for home collection or a visit to our centre.

  2. 2
    Blood sample taken

    A trained phlebotomist takes a small blood sample from a vein in your arm with a sealed, single-use needle. It takes about 2 minutes.

  3. 3
    Tested in our lab

    Your barcoded sample is tested on automated machines with strict quality checks.

  4. 4
    Report on WhatsApp

    A pathologist checks the result and the report reaches you on WhatsApp and email.

Frequently asked questions

About 2–3 hours at the centre. You must stay seated and not eat during the test.

Yes. Please fast for 10-12 hrs before your sample is collected. You can drink plain water.

Your report is usually ready in same day after the sample reaches our lab. We send it on WhatsApp and email, and you can also download it from the Reports page.

Please call our team to confirm whether home sample collection is available for your location and test.

This test needs a blood sample. Fast for 10–12 hours before the test (only water allowed). Take your usual medicines unless your doctor says otherwise.

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