Final answer:
Hyperglycemia is the correct term for an abnormally high blood glucose level, occurring when levels rise above 180-360 mg/100 ml, often associated with diabetes mellitus.
Step-by-step explanation:
An abnormally high blood glucose level is referred to as hyperglycemia. This condition occurs when the blood glucose level rises above 180-360 mg/100 ml. In people with diabetes mellitus, insulin production or function is impaired, leading to high levels of blood sugar. During a glucose tolerance test, used for confirmation of diabetes, hyperglycemia is observed. Moreover, fasting blood glucose levels above 125 mg/dL are indicative of diabetes. It is important to distinguish between hyperglycemia and other conditions such as ketosis or ketoacidosis, which can happen during fasting, starvation, or uncontrolled diabetes, but represent an accumulation of ketone bodies rather than glucose itself.