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+General screening
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[[Ultrasonography]] of the [[biliary tract]] encompasses the intra- and extrahepatic bile ducts, as well as the gallbladder.
==Basic screening==
*Scan the entire gallbladder in both its axial and transverse plane, looking mainly for gallstones (see [[Ultrasonography of gallstones|Ultrasonography of '''gallstones''']]) and wall thickening (see [[Ultrasonography of thickened gallbladder wall|Ultrasonography of '''thickened gallbladder wall''']]).
[[File:Ultrasonography of perihilar bile ducts, labeled.jpg|thumb|220px|Borderline of a dilated perihilar bile duct (see [[Ultrasonography of gallstones|Ultrasonography of ''gallstones'']] for detailed ranges).]]
*Measure the width of the bile ducts, which is usually easiest for the perihilar bile duct (which is the region where the common hepatic duct becomes the common bile duct, at the hilum of the liver). A normal width of the perihilar bile duct can be reported as for the extrahepatic bile ducts, since it also excludes a more distal common bile duct obstruction.
:Also take a look at intrahepatic bile ducts to rule out obvious dilation.
<gallery>
File:Ultrasonography of dilated intrahepatic bile ducts.jpg|Dilated intrahepatic bile ducts
</gallery>
===Report===
Example in a normal case:
<br>Gallbladder with thin wall and no gallstones. Normal width of the intra-and extrahepatic bile ducts.
{{Reporting}}
==Diseases==
