T0 and T120 Induced Hyperglycemia

Induced hyperglycemia (glucose tolerance test, dietary hyperglycemia test) is, along with fasting plasma glucose and glycated hemoglobin (HbA1c), one of the ways of confirming a diagnosis of diabetes or prediabetes. Interpretation criteria vary somewhat from country to country, and are regularly revised. Those appearing on your report come from the Canadian Diabetes Association (2013 version, revised 2018) and do not apply to pregnant women. Fasting blood glucose abnormality, defined as a blood glucose level between 6.1 and 6.9 millimoles per liter (mmol/L) AFTER A FAST OF AT LEAST 8 HOURS (no caloric intake), as well as the "glucose intolerance" category may be considered pre-diabetic conditions.

There are several conditions other than diabetes that can cause high fasting glucose levels: acromegaly (growth hormone-secreting pituitary tumour), acute stress, chronic kidney disease, overactive adrenal glands (Cushing’s disease), several medications, etc. Other conditions (gastric surgery, etc.) can also hinder interpretation of the test. The 2-hour glucose level must generally be higher than the fasting level. A fasting or 2-hour glucose level that is below normal could indicate a form of hypoglycemia.