A single ultrasound examination of the gallbladder is$20, and an examination of one part of the liver, spleen, gallbladder and pancreas is$30. The gallbladder examination involves an 8-hour fast to ensure that the bile ducts of the gallbladder are filled with bile and to reduce interference from gastrointestinal contents and gas. Usually, fasting starts at dinner 1 day before the examination, and 24 hours before the examination, fatty foods are fasted and medications that affect bile emptying are stopped. Gallbladder examination can observe the morphology and size of the gallbladder, measure the long diameter and anterior-posterior diameter, can observe whether the gallbladder wall is smooth, and can diagnose gallbladder polyps, gallbladder stones, gallbladder tumors, gallbladder adenomyosis and other diseases.