Final answer:
Elevated blood glucose levels ranging from 300-1000 mg/dL is known as hyperglycemia, which is generally associated with diabetes mellitus and indicates that the body's insulin is not effectively managing blood sugar levels.
Step-by-step explanation:
When the blood glucose levels are between 300-1000 mg/dL, this condition is referred to as hyperglycemia. This elevated blood glucose level indicates that the blood sugar is significantly higher than the normal range, which is about 70 to 130 mg/dL and may rise up to 140 mg/dL after eating. Hyperglycemia is commonly associated with diabetes mellitus, where there is insufficient insulin production or action to reduce blood glucose levels effectively. Glucosuria occurs when the blood glucose level is so high that the kidneys start to excrete glucose into the urine, indicating that the renal threshold for glucose (180 mg/dL) has been surpassed.