Diabetes mellitus develops when the body cannot properly use glucose, the main source of energy. This leads to increased blood sugar and, over time, damage to blood vessels, kidneys, eyes, and the nervous system. But diabetes can be kept under control if metabolic disorders are detected in time. The checkup includes key tests that provide a complete picture of carbohydrate metabolism and allow diabetes to be detected even in the early stages. Particularly important in the presence of risk factors: overweight, physical inactivity, heredity or history of gestational diabetes.