Glucose tolerance test (0-60-120 min), GTT
1 day 
Available with home visit We remind you that independent interpretation of the results is unacceptable, the information provided below is for reference purposes only.
Oral Glucose Tolerance Test (OGTT) is a standard diagnostic test used to detect disorders of carbohydrate metabolism, such as impaired glucose tolerance and diabetes mellitus. The test evaluates the body’s ability to metabolize glucose after an oral load of a concentrated glucose solution.
Indications
- diagnosis of carbohydrate metabolism disorders (prediabetes, diabetes mellitus)
- insulin resistance
- metabolic disorders associated with obesity
- assessment of glucose metabolism in the presence of risk factors
For pregnant women:
- screening for gestational diabetes
In our practice, as well as in some clinical protocols, a stepwise approach may be used: initially, fasting venous blood glucose is measured. If the result is abnormal or risk factors are present, the oral glucose tolerance test is recommended after a few days.
In pregnant women, the test is performed between 24–28 weeks of gestation, when physiological insulin resistance is most pronounced and the risk of gestational diabetes is highest.
Procedure
The patient arrives in the morning on an empty stomach. A venous blood sample is taken to determine baseline glucose levels. The patient then drinks a solution containing 75 g of glucose. Follow-up blood samples are collected at 60 and 120 minutes after the load to assess glucose dynamics.
| Component | Description |
|---|---|
| Glucose | A simple sugar that serves as a primary source of energy for cells. |
| Insulin | A hormone produced by the pancreas that regulates blood glucose levels. |
| Pancreas | An organ responsible for producing insulin and other digestive enzymes. |
Sources:
https://www.mayoclinic.org/tests-procedures/glucose-tolerance-test/about/pac-20394296
https://www.healthline.com/health/oral-glucose-tolerance-test
https://www.webmd.com/diabetes/oral-glucose-tolerance-test
https://www.ncbi.nlm.nih.gov/books/NBK532915/
https://www.verywellhealth.com/the-oral-glucose-tolerance-test-1087684
https://en.wikipedia.org/wiki/Glucose_tolerance_test
IMPORTANT!
It is crucial to remember that the information provided here is not intended for self-diagnosis or self-treatment. If you experience any pain or a flare-up of a condition, it is essential to consult a medical professional for proper diagnostic testing and treatment. Only a qualified healthcare provider can make an accurate diagnosis and determine the appropriate treatment plan. To ensure the most accurate and consistent evaluation of your test results, it is recommended to have them performed at the same laboratory. This is because different laboratories may use varying methods and units of measurement for similar tests.
Preparation:
- fasting for 8–12 hours before the test (water is allowed)
- 3 days before the test, a normal diet with adequate carbohydrate intake is recommended
- avoid alcohol consumption 24 hours before the test
- avoid intense physical activity the day before the test
- inform the physician about any medications currently being taken
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