How can I prevent high blood sugar emergencies?

Adherence . Test your blood sugars and take your medication as directed. If you have unusually high blood sugars, call your doctor before it becomes a crisis. If you have type 1 diabetes, call your doctor if you also have urine ketones.
Monitor. You should use a glucometer, and check your blood sugar at least once a day. Take your medicines as directed, stay on your diet, and if your blood sugar goes over 160, call your doctor.