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[[File:Ultrasonography of a gallstone.jpg|thumb|150px]]
*'''Gallbladder''': Gallstones are seen as hyperechoic objects, that leave an acoustic shadow. In case of similarity to a polyp ([[Ultrasonography of gallbladder polyps]]), turn the patient, making gallstones changing position, while polyps remain in the same place.
*'''Related structures''': Also exclude signs of cholecystitis, mainly pericholecystic fluid, gallbladder wall thickening, dilation of the bile duct(see below), and a sonographic Murphy's sign. Further information: [[Ultrasonography of cholecystitis]].{|class="wikitable" align="right"|+ Common bile duct diameter in adults<ref name=Lv>{{cite journal|url=https://www.ijntr.org/download_data/IJNTR01080032.pdf|title=Etiological Causes of Intrahepatic and Extrahepatic Bile Duct Dilatation|author=Yunfu Lv, Wan Yee Lau, Haiying Wu, Shunwu Chang, NingLiu, Yejuan Li, Jie Deng|journal=International Journal of New Technology and Research (IJNTR)|volume=1|issue=8|year=2015}}</ref>| Normal || ≤ 8 mm|-| Mild dilatation || 8 – 12 mm|-| Moderate dilatation || 12 – 16 mm|-| Severe dilatation || 16 – 20 mm|-| Extremely severe dilatation || >20 mm|}:*A '''dilated common bile duct''' is where it measures over 8 mm.<ref name=Lv/> It is distinguished from the portal vein and hepatic artery by absence of flow on Doppler.<gallery heights=230 widths=230>File:Ultrasonography of common bile duct stone, with arrow.jpg|In case of a dilated bile duct, an attempt can be made to follow it to detect visible gallstones therein, such as in this case.</gallery>
*'''Other:''' It is also proper practice to perform a {{general upper abdominal screening}}.
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