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==Procedure==
*Take an initial anteroposterior image of including the presumed locations of the gallbladder and common bile duct.
*Infuse iodinated contrast, usually amounting to approximately 5-10g (or about 10 to 30 ml of concentration 350mg/ml), and note the following:
:*Location of the tip of the drain in relation to the gallbladder
:*Any visible dilatation of the biliary tract
:*Any contrast outside the drain or biliary tract, including leakage along the outside of the drain.
:*Any visible stones in the gallbladder stonesor bile duct ===Drain malposition===If the drain is partially pulled out, it can be pushed into place, preferably with a hydrophilic guidewire.
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