The bleeding that occurs while you take the inactive pills isn't the same as a regular period. Nor is the bleeding necessary for health. This is good news if you take birth control pills and want more control over your menstrual cycle, either for personal or medical reasons.
To prepare for the glucose tolerance diagnostic test: 1  Eat a balanced diet that contains at least 150 grams (g) of carbohydrate per day for 3 days before the test. Fruits, breads, cereals, grains, rice, crackers, and starchy vegetables such as potatoes, beans, and corn are good sources of carbohydrate.
The tests are: 1  Fasting plasma glucose test (FPG): You canât eat anything for eight hours leading up to a FPG test. That's why a FPG test is often done in the morning. 2  Oral glucose tolerance test (OGTT): This is another test used to diagnose prediabetes.