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
Halibut with Warm Lemon Sauce Garlic Pea Soup Enlitened Vichyssoise Chickpea Salad Hoisin-Glazed Pork Skewers Super Creamy Mushroom Soup Sake Brined Pork Cottage Cheese Veggie Dip Pineapple Salad Spring Berry Cheesecake
Last Saturday, I’d been struggling with an entire week above 200 that just didn’t seem to want to budge. So I decided that I couldn’t risk the Omnipod anymore and I had to pull it from my management routine, at least until things settled down. I started twice-daily Lantus injections on Saturday night and have been working out the kinks of being back on MDIs since then. The first three days of switching to MDIs were rough. Watching the Lantus take effect slowly was like waiting for...