The 668 area code is NOT a valid area code. This area code is NOT officially assigned to a known Numbering Plan Area (NPA).The 668 area code is not assigned to a city/state location.In most cases with invalid area codes like 668, tend to be used by phone numbers from telemarketing companies.he 668 area code is NOT a valid area code. This area code is NOT officially assigned to a known Numbering Plan Area (NPA).
Fasting glucose (fasting blood glucose, FBG) â this test measures the level of glucose in the blood after fasting for at least 8 hours. 2-hour glucose tolerance test (GTT) â for this test, the person has a fasting glucose test done (see above), then drinks a 75-gram glucose drink. Another blood sample is drawn 2 hours after the glucose drink. This protocol challenges the person's body to process the glucose.
Test Procedure. A fasting blood glucose test â also called a fasting plasma glucose, or FPG test â measures blood glucose levels after you've gone without food for at least eight hours. It's reliable, and the results aren't affected by your age or the amount of physical activity you do.ormal blood glucose levels are less than 100 mg/dL. (Read as 100 milligrams of glucose for each deciliter of blood.. A deciliter is 1/10th of a liter.). 1  If your blood glucose measures 126 mg/dL or higher, your doctor will order a second test.