Glucose Tolerance Test (GTT) – Diagnosing Diabetes and Gestational Diabetes
The Glucose Tolerance Test (GTT) is used to assess how well your body processes sugar and to diagnose diabetes and gestational diabetes. It measures your blood sugar levels at different intervals after you consume a glucose solution.
Indications for GTT:
● Diabetes screening: Particularly useful for diagnosing type 2 diabetes and prediabetes.
● Gestational diabetes: Performed during pregnancy to screen for gestational diabetes.
Normal Range:
● Fasting: Less than 100 mg/dL
● 2-Hour Post-Glucose: Less than 140 mg/dL
Abnormal Test Significance:
● Impaired Glucose Tolerance (IGT): A 2-hour blood sugar level between 140–199 mg/dL may indicate prediabetes.
● Diabetes: A 2-hour blood glucose level of 200 mg/dL or higher after glucose ingestion suggests diabetes.
● Gestational Diabetes: Fasting blood glucose between 92–125 mg/dL or 2-hour values above 153 mg/dL during pregnancy indicate gestational diabetes.
Management:
● Prediabetes: Lifestyle changes such as diet modification, exercise, and weight management can help prevent the development of diabetes.
● Diabetes: Management includes lifestyle changes, oral medications, or insulin therapy. For gestational diabetes, blood sugar monitoring, diet, and sometimes insulin are required.
FAQ:
How do I prepare for a Glucose Tolerance Test?
You will need to fast for at least 8 hours before the test. A glucose solution will be given, and your blood will be drawn at various intervals.
Can I eat after the test?
Yes, after the test is completed, you can resume normal activities and eat.
Disclaimer:
The results of the GTT should be interpreted by a healthcare provider to determine the appropriate diagnosis and treatment. Lifestyle changes and medications may be recommended based on results.
