Ultrasound examination of liver, gallbladder and pancreas should not be done after eating, but other ultrasound examinations are not affected. 1. Liver, gallbladder, pancreas are located adjacent to the stomach, after eating, the stomach will be filled up, resulting in the corresponding ultrasound examination will be affected, will greatly increase the probability of missed diagnosis, so in the ultrasound examination of these organs must be fasting. 2. Other parts of the body are relatively far from the stomach and intestines, and even after eating there is no effect on their examination, so ultrasound examination of other parts of the body usually do not need to fasting. Before doing ultrasound, you should pay more attention to the precautions in the checklist of the appointment, and if you have any questions or discomfort, the doctor will analyze and guide you to make a clear diagnosis, so as not to affect the results of the examination.