Oral Glucose Tolerance Test (OGTT)
Explanation
The Oral Glucose Tolerance Test (OGTT) measures the body's use of glucose (sugar). Glucose is the body's main source of energy. Insulin (produced by the pancreas) helps the body use glucose. People with certain disorders do not use or produce insulin well. Therefore, the body cannot use its glucose.
The Test
Blood laboratory levels can be affected by food. Therefore, the patient cannot eat before the test. He / she can only drink water 8 - 12 hours before the test.
On the day of the test, the patient drinks a sweet beverage. Blood is obtained and tested before and at thirty minute intervals (for up to 3 hours) after drinking it to measure glucose (and insulin, if required) levels over time.
- Upon arrival, the patient may have a height and weight measurement.
- A small needle will be used to take blood from a vein. The blood is tested. Most often, this vein is in a hand or arm. Some patient's complain of pain when the needle is placed. Others describe a prick or stinging sensation. A skin numbing cream can sometimes be used to eliminate pain, if planned in advance.
- The patient is then given a very sweet drink. It is important to finish this drink in 5 minutes.
- Blood is tested at thirty minute intervals (for up to 3 hours) after finishing the drink.
- When the test is finished, the patient is given a meal of his / her choice.
After the Test
Test results are available from your physician 1 - 2 weeks after the test date. The patient should not feel any side effects from this test except for mild discomfort or stiffness at the blood draw site.
Tips
The patient should dress comfortably. You may bring an item of comfort such as a doll, blanket or stuffed animal.
Contact Us
For additional information on this or any Health Topic, please call the Family Resource Center, 513-636-7606, or your pediatrician.
Rev. 4/06
