What is a Glucose test?

The oral glucose test (OGTT) measures the body’s ability to use a type of sugar, called glucose, that is the body’s main source of energy.  An OGTT can be used to diagnose prediabetes and diabetes.

What is the purpose of a Glucose test during your pregnancy?

A OGTT is commonly done to check for diabetes that occurs with pregnancy (gestational diabetes).  Patients with Gestational Diabetes will also need to take a glucose tolerance test during their post partum period.

What types of pregnant women are most likely to get gestational diabetes?

Pregnant women who have had gestational diabetes in a previous pregnancy, women with a strong history of diabetes, those who have given birth to a baby who weighed more than 9lbs, and women who are younger than age 25 and are overweight before getting pregnant.

How do I prepare for a Glucose tolerance test?

1 hour test – No specific diet is required, just eat as you normally would.
3 hour test – Eat a balanced diet for at least 3 days prior to the test including an extra carbohydrate added to each meal.  Carbohydrates include: fruits, breads, cereals, rice, crackers, and starchy vegetables.

How long does the glucose tolerance test take?

The initial glucose tolerance test takes 1 hour.  If the patient does not pass the 1 hour test a second glucose tolerance test is scheduled which takes 3 hours.

What happens on the day of the test?

For the one hour test you will drink a sweet liquid containing a measured amount of glucose.  It is best to drink the liquid quickly; you are given 5 minutes to drink the liquid.

Why do I need to remain in the office during the testing?

Since activity can interfere with test results, you will be asked to remain in the office and sit quietly during the entire test.  You cannot eat or drink during the test, this includes gum and candy.

Do I need a glucose tolerance test after I deliver if I had gestational diabetes?

Yes you will be required to take a glucose tolerance test the same as pregnant patients.

Do I have to fast before having lab work done?

It depends on what the lab work is and why you are having lab work done.  Our staff will inform you if you need to make certain considerations for lab work.