1, abdominal ultrasound examination should be performed in the morning on an empty stomach, including liver, gallbladder, pancreas, bile duct, retroperitoneum and large abdominal vessels, etc. Fasting after 9 pm and drinking after 12 pm before the examination. 2.Ultrasound examination should be arranged before endoscopy (gastroscopy), barium meal and cholangiography. Due to the interference of gastrointestinal gas, upper abdominal ultrasonography should not be done in the afternoon even if prepared on an empty stomach. Emergency ultrasound examinations (e.g. trauma, suspected biliary stone impaction, etc.) are not subject to the above conditions. Ultrasound diagnosis and treatment department of Shandong Qianfo Mountain Hospital Li 3. Bladder, prostate, seminal vesicle, ureteral stones, gynecological and early pregnancy ultrasound examination (before 13 weeks, i.e. within 3 months of pregnancy) should be performed after holding urine. Patients should drink 500~1000ml of water 1~2 hours before the examination. 4. Transrectal examination of the prostate and seminal vesicles should be preceded by defecation and moderate urine holding. The urine should be emptied before transvaginal ultrasound examination, and it is advisable to examine after menstruation to avoid infection. 5.Usually, no special preparation is needed for the examination of fetus, kidney, spleen, eye, thyroid, breast, blood vessels of the limbs and adult heart in the middle and late pregnancy. 6. In the absence of special circumstances (coma, severe trauma, etc.), patients are advised to wear loose clothing to the clinic. Do not wear necklaces and other ornaments for neck ultrasound examinations (including thyroid, neck vessels, etc.). 7.If infant patients do not cooperate, they can be examined after taking sedative drugs under the guidance of clinicians. 8.Some examinations may require special preparation due to different conditions of patients, and the ultrasonographer will provide specific instructions when needed.