A glucose test measures the level of glucose in your blood to assess how well your body processes sugar. It is commonly used to diagnose conditions like diabetes and prediabetes. The test can be done after fasting or at random times during the day, depending on the type of test being performed. There are different types of glucose tests, including the fasting blood glucose test, the oral glucose tolerance test, and the A1C test. Each test provides valuable information about your blood sugar levels and helps healthcare providers determine the best course of action for managing your health.