Diet Samples3 Hour Glucose Tolerance Test
It’s not uncommon to fail the one hour glucose tolerance test and go on to pass the 3 hour test.
The 1 hour glucose test requires you to drink 50 grams of a highly concentrated glucose solution to be read at the 1-hour mark.
The 3 hour glucose test requires you to drink 100 grams. To prepare for the test, three days beforehand eat a diet that contains at least 150 grams of carbohydrates a day. About 10 to 14 hours before the test, you do not eat or drink anything except for water.
Schedule the test for early in the morning. The first sample of blood is drawn to take a baseline reading. Next you will drink a glucose solution that contains 100 grams of glucose. Many women get nauseated drinking the solution, but you must drink it quickly for the test results to be accurate. If you throw up any of the solution, you will need to come back a different day to take the glucose tolerance test.
How do you know if you’ve failed the 3 hour test?
If two or more of your blood sugar levels are higher than the diagnostic blood glucose values, you have gestational diabetes. Once you’ve been diagnosed with gestational diabetes, your doctor will develop a plan with your dietitian.
Normal Results -
- 100mg at 3 hours
Positive Results -
- Fasting – 105mg
- 1 hour – 190mg
- 2 hours – 165mg
- 3 hours – 145mg
Occasionally, if the mother fails one of the above tests in the 3 hour, the doctor may request you repeat the 3 hour glucose tolerance test.