Blood sugar tests measure the amount of glucose in your blood. These tests help diagnose and manage conditions like diabetes. They can be performed using a small device called a glucometer or through laboratory blood samples. There are different types of blood sugar tests, including the fasting blood sugar test, which measures glucose after an overnight fast, and the A1C test, which provides an average blood sugar level over the past two to three months. Regular testing is important for maintaining healthy blood sugar levels and preventing complications.