Before an ECG, it is recommended to pay attention to the following points: You must remove your upper clothing and all jewelry. It is advisable to wear comfortable and easily removable clothes. Immediately before the test, excessive physical activity and smoking should be avoided. It is important to dry any sweat in the application areas to ensure the electrodes adhere properly. For male patients, excessive chest hair may need to be shaved before the ECG to prevent it from interfering with electrode contact. It is very important to inform your doctor about any regular medications you are taking before the ECG test.