Normally, your pancreas releases insulin when your blood sugar, or “bloodglucose,” gets high -- after a meal, for example. That signals your body to absorb glucose until levels get back to normal. But if you have diabetes, your body doesn’t make insulin (type 1 diabetes) or doesn’t respond to it normally (type 2 diabetes). That can leave your blood sugar too high for too long. Over time, that can damage nerves and bloodvessels and lead to heart disease and other problems. If you have diabetes, your doctor may ask you to keep track of your blood sugar by testing it at home with a special device called a blood glucose monitor or home blood sugar meter. It takes a small sample of blood, usually from the tip of your finger, and measures the amount of glucose in it.