The use of insulin even if blood glucose is not high can be seen in the case of diabetic patients who need insulin to control their blood glucose, or hyperkalemia patients who need glucose infusion together with insulin treatment, etc. It is recommended to treat under the guidance of a doctor. If diabetic patients apply insulin treatment routinely, they should continue to use insulin treatment even if their blood glucose control is stable and not too high, because once stopping the medication, it may lead to the blood glucose rising again. In addition, clinically, for patients with hyperkalemia, a certain amount of insulin should be added to the glucose infusion, which can help the transfer of extracellular potassium ions to intracellular, thus lowering the blood potassium concentration. If you are not sure why you need to use insulin even though your blood sugar is not high, you can consult a professional doctor for an answer.