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
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Today marks 22 years with type 1 diabetes for me. It doesn’t seem real. When I see other diabetics who have had it for 40, 50, 60 years, it just makes it feel like there is so much further to go. An endless amount of this life. 22 years is a lifetime for me. It is 85% of my life…22 years out of just 26. And I don’t even remember the first four diabetes-free years. Do not get me wrong. I am grateful for a fairly healthy 22 years. I do not have complications. I have been blessed to...