Quick Reference
- Full form
- Glucose Tolerance Test
- Sample type
- Blood
- Fasting
- 8 to 10 hours required
- Marker measured
- 1
- Report turnaround
- Next day
- Available at
- All locations
About Glucose Tolerance Test
The Glucose Tolerance Test gives a definitive diagnosis for gestational or general diabetes by tracking your blood sugar at multiple time points after a glucose load. It is more detailed than the screening version.
We require 8 to 10 hours of fasting before starting this test. Results are available the next day.
How to Prepare
- Fasting for 8 to 10 hours is required before this test.
- Plan for about 2 to 3 hours at our lab for the full test.
Frequently Asked Questions
How long should I fast before a Glucose Tolerance Test?
We require 8 to 10 hours of fasting before the test begins.
How is this test different from the screening version?
It tracks blood sugar at multiple time points after a glucose load, giving a definitive diagnosis rather than just a screening result.
How long does the full test take?
It typically takes a few hours, since blood is drawn at set intervals after the glucose drink.
Is this test used outside of pregnancy?
Yes, it can also be used to diagnose diabetes or pre-diabetes in non-pregnant patients.
How soon will my report be ready?
Next day.
Is home sample collection available?
This test requires timed in-clinic monitoring, best done at our lab for accurate multi-point sampling.
This page provides general health information and is not a substitute for medical advice. Speak with your doctor about your specific results and treatment.