Examination of the pancreas requires an empty stomach because the pancreas is in the upper abdomen and below the stomach and is easily affected by the stomach. After eating, there are food residues inside the stomach. Moreover, when eating and drinking, gas is brought in, so the gastrointestinal tract can cause great disturbance to the pancreas, which in turn causes poor display of the pancreas in ultrasound and misses the diagnosis of small lesions. For example, the liver, gallbladder, pancreas, spleen, large blood vessels in the abdomen, and large blood vessels in the kidneys and renal, posterior peritoneum, and esophageal heart ultrasound need to be examined on an empty stomach for the purpose of examination. How to know if fasting is required for the examination, there will be a note at the bottom of the application form issued by the doctor. These matters that should be noted are marked, and if fasting is required for the examination, it will be indicated that fasting is required. If you need to fill your bladder, it will clearly show that you need to fill your bladder, so just look at the application form and you will know what preparation you need to do for the test. So the application form is the most important information, not only to give the doctor clinical symptoms, but also to be able to provide some help during the ultrasound examination, including symptoms and complaints are shown on it. It is also beneficial for the patient himself, what preparations need to be done are written on the application form.