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Choose collection locationDiabetes · Individual laboratory test
Glucose Tolerance Test (GTT, 100 Grams)
The 100 g pregnancy glucose tolerance test follows a fasting sample with three timed measurements. The full sequence shows how blood glucose responds over three hours.
Price for this test on its ownAED 250Test price AED 150
Clinical authorDr Nirupama SabhapathySpecialist Clinical Pathology
- Sample
- Plasma (NaF)
- Laboratory turnaround
- 24 hours
- Collection
- Dubai
- Laboratory
- Intel Lab
Understanding the test
What does the Glucose Tolerance Test (GTT, 100 Grams) measure?
Also called Oral Glucose Tolerance (100g)
A clinician may request this diagnostic test after a raised pregnancy glucose screen. The fasting, one-, two- and three-hour readings belong to one sequence.
When it may be requested
Following a raised screen
A fasting diagnostic series may be part of the pregnancy pathway after an abnormal screening result.
Comparing time points
The baseline and three timed results allow the maternity clinician to interpret the complete response.
Inside this test
What the laboratory looks for
In this test
- Fasting glucose
- 1-hour glucose
- 2-hour glucose
- 3-hour glucose
Before your sample
Prepare for collection
SpecimenPlasma (NaF)
Your checklist
Keep to your usual diet beforehand and follow the maternity team's overnight fasting instructions. Check medicine timing in advance. Tell the team if you are unwell on the day or vomit after the drink.
A fasting blood draw comes first, followed by the glucose drink and samples at each scheduled hour. At home the team returns for those samples. In Deira, allow for the initial draw and three hours after the drink.
Smart Report
Understanding your result
24 hoursLaboratory turnaround
Result guideGlucose Tolerance Test (GTT, 100 Grams)
Reading your result
The diagnostic interpretation uses the pattern of values under the relevant pregnancy protocol. A value drawn at the wrong time cannot simply be substituted for another stage.
What can affect it
- Incomplete or incorrectly timed samples can make the series difficult to interpret.
From sample to follow-up
Your testing journey
Laboratory testGlucose Tolerance Test (GTT, 100 Grams)
- Specimen
- Plasma (NaF)
- Turnaround
- 24 hours
Open your laboratory report
Look for Glucose Tolerance Test (GTT, 100 Grams) in your report. Use the sample type and collection time when comparing it with an earlier report.
Explore Smart Report
Discuss the next step
Review all four results with your maternity clinician, including the actual sample times and any interruption to the test.
Clinical expertise
Your laboratory team
Patient questions
Before you book
How much time should I allow in Deira?
Allow the fasting draw and drink, then three hours for the scheduled samples. Tell the team if you feel unwell or cannot finish the drink because timing affects the results.
What information should I bring from my maternity appointment?
Bring the referral, any earlier glucose screen and your instructions about fasting and medicines. The maternity team uses the pregnancy-specific protocol to review the result.
Can the two-hour sample replace the three-hour sample?
The measurements represent different points after the drink. If a sample is delayed or missed, the team records it and your clinician decides how to proceed.
Can I eat or go out between blood draws?
Set aside the three hours for the test and leave food and errands until after the last draw. Ask the team whether you can sip plain water. Bring something to read while you wait.
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Your next step
Glucose Tolerance Test (GTT, 100 Grams) at home.
Sources & further reading
Written by Dr Nirupama Sabhapathy, Specialist Clinical Pathology. Medically reviewed by Dr Joyce Jose, Specialist Clinical Pathology, on .
Catalogue information and AED price checked on 2 November 2026. Clinical suitability, preparation, collection arrangements and turnaround are confirmed for your selected test.