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Informed by recognized medical guidance
A glucose tolerance test (GTT) checks how well your body processes sugar (glucose). The results can show if your blood sugar is normal, slightly high (impaired glucose tolerance or pre-diabetes), or high enough to be diabetes.
Key facts
Abnormal glucose tolerance is common. Many adults have pre-diabetes, and millions have diabetes. The test helps catch problems early.
Anyone can have abnormal glucose tolerance, but it is more common in people who are overweight, have a family history of diabetes, are over 45, or have certain ethnic backgrounds.
A glucose tolerance test is one way to diagnose diabetes or pre-diabetes. Your doctor will interpret the results along with other tests.
You will need to fast for 8-12 hours before the test. A needle is placed in your arm to draw blood. After the glucose drink, you must wait in the clinic and have more blood draws. The test takes about 2-3 hours. You should not eat or drink anything except water during the test.
Treatment depends on whether you have pre-diabetes or diabetes. It focuses on controlling blood sugar to prevent complications.
Your doctor may prescribe medications to help control blood sugar. These can include tablets or injectable medicines. Never stop or change medications without speaking to your doctor. Insulin injections may be needed for some types of diabetes.
Living with abnormal glucose tolerance involves checking your blood sugar regularly, taking any prescribed medications, and making healthy choices. You can still lead a full, active life.
A diet rich in vegetables, whole grains, lean proteins, and healthy fats helps manage blood sugar. Exercise helps your body use insulin better. Aim for 150 minutes of moderate activity per week, like brisk walking or cycling.
For many people, type 2 diabetes and pre-diabetes can be prevented or delayed with healthy lifestyle changes, such as losing weight, eating well, and exercising.
If you have risk factors, your doctor may recommend screening tests like a glucose tolerance test or HbA1c every 1-3 years.
With early detection and proper management, most people with abnormal glucose tolerance can prevent or delay complications and live long, healthy lives. The key is to work with your healthcare team and stay committed to healthy habits.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 16, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.
Surgery is not a standard treatment for abnormal glucose tolerance. In some cases, weight loss surgery (bariatric surgery) may be considered for people with obesity and type 2 diabetes, but it is not the first option.
A diagnosis of pre-diabetes or diabetes can be stressful and may lead to anxiety or depression. It is important to talk to your healthcare provider about how you are feeling. If you need urgent help, contact a crisis support line.