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
Raspberry-Cranberry Granita Stir Fry Mushroom Trio Sweet White Chili Tuna and Pineapple Sandwich Baked Whitefish in Butter and Basil Sauce Steakhouse London Broil South of the Border Squares Tilapia with Vegetable Topping Oriental Soup with Noodles Shrimp Salad With Orzo
When I first heard the news of Usher’s son’s diagnosis of type 1 diabetes, I thought, “how sad to have yet another young member of our T1 community.” My second thought, though, was, “How can Usher help me?” Like Princess Leia’s hologram to Obi-Wan Kenobi, I’m feeling compelled to get a message to Usher to let him know just how dire the situation is. I regret that I am unable to present my request to you in person but my...