2. The anatomic or functional manifestations of a disease: the pathology of cancer. 3. A departure or deviation from a normal condition: Neighborhoods plagued by a self-perpetuating pathology of joblessness, welfare dependency, crime (Time).
1 A fasting blood sugar level from 100 to 125 mg/dL (5.6 to 6.9 mmol/L) is considered prediabetes. If it's 126 mg/dL (7 mmol/L) or higher on two separate tests, you have diabetes.  Oral glucose tolerance test. For this test, you fast overnight, and the fasting blood sugar level is measured.
In fact, the American Diabetes Association has set the level for prediabetes at a blood glucose measurement of HbA1C 5.7% (39mmol/mol) but it is the only organisation which uses this criteria. In the UK there is no defined criteria for prediabetes or borderline diabetes.