What Is an Oral Glucose Tolerance Test (OGTT)?
The Oral Glucose Tolerance Test (OGTT) is a lab test that measures how the body uses glucose (sugar). Glucose is the body's main source of energy. Insulin is a hormone made by the pancreas that helps the body use glucose.
Your healthcare provider may order this test along with other blood work to help diagnose any problems with the way your child’s body handles sugar.
Discussing the test ahead of time with your child is helpful.
Description of the Test
Blood glucose levels can be affected by food. Your child cannot eat for eight hours before the test. They can only drink water.
- Upon arrival, your child may have their height and weight measurements taken.
- Your child will have an IV catheter (a small thin tube) placed in their arm. Blood is drawn through the IV. Getting an IV may hurt when inserted, but it is done quickly. Your child is then given a very sweet drink that they must finish in 5 minutes.
- Blood is taken through the IV and tested at three time points (for up to three hours) after finishing the drink to measure glucose and insulin levels.
- After the test, your child can eat a meal of their choice, and the IV is removed.
After the Test
Test results will be ready two weeks after the test date. Lab results will show up in MyChart as they come in. Your provider will contact you with the results.
Tips
Your child should dress comfortably for the test. You may bring an item of comfort like a doll, blanket or stuffed animal.
