Oral Glucose Tolerance Test
Women who have a blood sugar level greater than 140 mg/dl (7.8 mmol/l) on their 50 gram glucose test may have gestational diabetes during pregnancy, and require a follow-up test called a 3-hour oral glucose tolerance test (OGTT).
The OGTT requires dietary preparation. For three days prior to the test, 150 grams of carbohydrates should be consumed daily. Then a fasting period of 10 to 14 hours before the test is required; only water is allowed during this time. Because of the fasting component, the OGTT is usually performed first thing in the morning in a doctors office or outpatient lab. An initial blood sample is drawn to measure fasting blood glucose levels, and then the patient is given 100 grams of a glucose drink (the same type as that given in the glucose challenge) to consume. After that, blood samples are drawn every hour for 3 hours and blood glucose levels are measured.
The American Diabetes Association sets the following guidelines for results from the OGTT:
- Fasting Blood Glucose Level95 mg/dl (5.33 mmol/l)
- 1 Hour Blood Glucose Level140 mg/dl (7.8 mmol/l)
- 2 Hour Blood Glucose Level120 mg/dl (6.7 mmol/l)
If two or more blood sugar levels are higher than the levels indicated, gestational diabetes is diagnosed.
1 - American Diabetes Association. ADA Standards of Medical Care in Diabetes?2010. Diabetes Care, Volume 33, Supplement 1, January 2010.
Reviewed by Francine Kaufman, MD. 4/10
Sloppy Joes Fresh-from-the-Garden Olive Toss Ginger Grilled Tenderloin Fresh Mozzarella Crostini Salmon and Asparagus Wraps Spiced Apple Delight Stuffed Spinach Tomatoes Shallot Thyme Vinagrette Strawberry-Banana Cream Pie Grilled Sirloin Steak with Olive Sauce
I am in desperate need of a nap. Between frequent bathroom trips and constant tossing and turning overnight, my sleep has dwindled. But what do you expect at almost 33 weeks pregnant? My whole body is tired these days though. Two weeks ago, a mix of severe lightheadedness and some weird blood pressure readings at home had my doctor send me to Labor & Delivery for a couple of hours of observation. My blood pressure was fine while at the hospital and I haven’t been checking as...