In general, liver, gallbladder, spleen and pancreas ultrasound is susceptible to interference and therefore fasting is usually required during a liver, gallbladder, spleen and pancreas ultrasound. Hepatobiliary, splenic and pancreatic ultrasound uses ultrasound to perform a detailed examination, and is therefore highly susceptible to interference from gases in the body. After eating, the body will produce a large amount of gas in the body during the digestion of food, so that the ultrasound wave will reflect less after entering the body, thus affecting the results of the ultrasound. Therefore, it is necessary to fast for eight hours to do the color ultrasound of liver, gallbladder, spleen and pancreas. Keep a light diet a few days before the ultrasound of liver, gallbladder, spleen and pancreas, and do not consume too much stimulating food that will cause discomfort on the day of the test, thus affecting the normal test results. Please make specific arrangements for the test under the guidance of your doctor.