How long does it take to have an abdominal ultrasound examination on an empty stomach?

Generally, abdominal ultrasound examination requires fasting for 8-12 hours, and the specific time may be adjusted due to differences in the examination site, individual differences, or medical advice. The main purpose of fasting for abdominal ultrasound examination is to reduce the interference of gastrointestinal contents on ultrasound imaging. Food residues or gases in the stomach may obstruct the visualization of organs such as the liver, gallbladder, pancreas, and spleen, affecting the doctor's observation of minor lesions. Routine liver, gallbladder, pancreas, and spleen ultrasound suggest fasting for at least 8 hours to ensure complete gastric emptying. If simultaneous observation of the stomach or duodenum is required, it may need to be extended to 12 hours. 1-3 days before the examination, high-fat diet and easily gas producing foods such as beans and milk should be avoided to reduce intestinal gas accumulation. On the morning of the day of examination, it is necessary to fast food and water, but some special people, such as diabetes patients, can drink a small amount of water according to the doctor's advice. Some hospitals may adopt improved plans to shorten fasting time for children or emergency patients.

Before inspection, remove metal jewelry and wear loose clothing. Long term medication users should inform their doctors in advance to avoid risks caused by sudden discontinuation of medication. If there is no special medical advice after the examination, it is recommended to eat immediately and prioritize light and easily digestible foods. If abnormal results are found, further diagnosis should be made by combining blood tests or enhanced CT scans. Regular check ups are recommended to undergo abdominal ultrasound once a year, and those with a history of chronic liver disease or gallstones can shorten the follow-up interval.