Diet Samples1 Hour Glucose Tolerance Test
The most common glucose tolerance test is the oral glucose tolerance test (OGTT). You are not to eat or drink anything, besides water, after midnight prior to the test. For the 1 hour glucose tolerance test, you will need to drink a liquid containing a concentrate of glucose. Your blood is taken to test your sugar level 1 hour after you’ve drunk the glucose solution. It’s important to drink the full 50 gram solution under 5 minutes to get accurate gestational diabetes testing results. You are not to eat during the test.
The oral tolerance test is used to screen pregnant women for gestational diabetes,a temporary form of hyperglycemia, between weeks 24 and 28. You may be tested earlier in cases where gestational diabetes is suspected due to high risks for gestational diabetes due to health or family history.
If you have gestational diabetes, your doctor will usually order glucose levels throughout the rest of your pregnancy and after delivery to monitor your condition.
Gestational Diabetes Screening: Glucose Tolerance Test
| GLUCOSE LEVEL | INDICATION |
|---|---|
| Less than 140* mg/dL (7.8 mmol/L) |
Normal screen |
| 140* mg/dL (7.8 mmol/L) and over |
Abnormal, needs OGTT (see below) |
| * Some use a cutoff of >130 mg/dL (7.2 mmol/L) because that identifies 90% of women with gestational diabetes, compared to 80% identified using the threshold of >140 mg/dL (7.8 mmol/L) but this can cause many false positives which will require the pregnant mom to take the 3 hour glucose tolerance test. |
|