Diabetes Mellitus
Diagnosis

Your doctor will first ask about your medical history and perform a physical examination to check for symptoms of diabetes and high blood sugar. Diabetes usually is diagnosed with the following tests that measure the glucose levels in your blood:

• Fasting Plasma Glucose Test This is the standard test for diagnosing type 1 and type 2 diabetes. You must not eat or drink anything for at least eight hours prior to this simple test in which blood is drawn to check your sugar levels. A diagnosis of diabetes will be made if you have a fasting blood sugar level of 126 milligrams per deciliter or higher on two separate days.
• Other Tests Diabetes also may be diagnosed based on a random high glucose level of 200mg/dl and symptoms of the disease. Your doctor may wish to perform an oral glucose tolerance test, which is the traditional test for diabetes mellitus.