GTT-Glucose Tolerance Test

GTT stands for "Glucose Tolerance Test," which is a diagnostic test used to evaluate how the body regulates glucose (sugar) after consuming a specific amount of glucose. The test is often used to diagnose diabetes and gestational diabetes (a type of diabetes that occurs during pregnancy).

Here's an overview of how the Glucose Tolerance Test is typically conducted:

1. Fasting:

   • The test often begins in the morning after an overnight fast (usually 8-12 hours of no food or drink other than water).

2. Baseline Blood Sample:

   • A blood sample is taken to measure the fasting blood glucose level. This provides a baseline for comparison.

3. Glucose Drink:

   • The person then drinks a solution containing a specific amount of glucose (usually 75 grams for adults).

4. Blood Samples at Intervals:

   • Blood samples are taken at intervals, typically at 1 hour and 2 hours after drinking the glucose solution.

5. Analysis:

   • Each blood sample is analyzed to measure the level of glucose in the bloodstream. The results are used to assess how the body handles glucose at different time points.

Interpretation of Results:

• Normal: A normal glucose tolerance test shows a rise in blood glucose levels after drinking the glucose solution, followed by a gradual return to baseline. Normal ranges can vary, but generally, a fasting level below 100 mg/dL and a 2-hour level below 140 mg/dL are considered normal.
• Impaired Glucose Tolerance (IGT): Elevated glucose levels at the 2-hour mark (between 140-199 mg/dL) may indicate impaired glucose tolerance, a condition that may precede diabetes.
• Diabetes: A diagnosis of diabetes may be made if the 2-hour blood glucose level is 200 mg/dL or higher.

GTT in Gestational Diabetes:

• Pregnant women may undergo a modified version of the GTT to screen for gestational diabetes. The procedure is similar, but the glucose solution may contain a different amount of glucose, and the criteria for diagnosis can be different.

It's important to note that the Glucose Tolerance Test is just one of several diagnostic tools used to assess glucose metabolism. The interpretation of results and diagnostic criteria can vary based on guidelines from different health organizations. The test is typically administered under the supervision of healthcare professionals. If you have concerns about your glucose metabolism, it's essential to consult with your healthcare provider for appropriate testing and interpretation of results.