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
Low-Fat Stuffed Shells Easy Baked Chicken Red Bean Chili with Beef Vietnamese-Style Beef & Noodle Broth Thai Barley Stir-Fry Baked Barbeque Chicken Beef Stroganoff Scalloped Red Potatoes dLife Salsa Potato Salad a la Italia
I'm sitting waiting for a table at the cafe' for me and a friend who is running a bit late. Feeling a little off, I grab my test kit and poke my finger, getting a little blood droplet. "Does that hurt?" Asks the man sitting next to me. He's an older guy, with some pretty profound ear hair. I note the ear hair as I say "Sort of... I think I'm kind of used to it now. I've been doing it a long time." My sugar is a little elevated...