How are the results of the glucose tolerance test evaluated?
Glucose tolerance tests may lead to one of the following diagnoses: • Normal response: A person is said to have a normal response when the 2-hour glucose level is less than 140 mg/dl, and all values between 0 and 2 hours are less than 200 mg/dl. • Impaired glucose tolerance: A person is said to have IGT when the fasting plasma glucose is less than 126 mg/dl and the 2-hour glucose level is between 140 and 199 mg/dl. • Diabetes: A person has diabetes when two diagnostic tests done on different days show that the blood glucose level is high. This means either the 2 hour levels is greater than 200 mg/dl or the fasting glucose is noted as greater than 126 mg/dl. • Gestational diabetes: A woman has gestational diabetes when she has any two of the following: a 100g OGTT, a fasting plasma glucose of more than 95 mg/dl, a 1-hour glucose level of more than 180 mg/dl, a 2-hour glucose level of more than 155 mg/dl, or a 3-hour glucose level of more than 140 mg/dl.
