During routine cholecystectomy, surgeons will often perform an intraoperative cholangiogram in an effort to define anatomical landmarks and ensure patency and drainage of the common bile duct. This involves injecting a radiopaque contrast medium into the biliary tree during the operation. Occasionally contrast injection onto the common bile duct will reveal an abnormality and are deemed a "positive intraoperative cholangiogram" (positive IOC). These abnormalities can include the following: single or multiple stones; non-filling of the duodenum by contrast; stenosis or narrowing of the common bile duct (CBD). When discovered these findings are better addressed and treated endoscopically via endoscopic retrograde cholangiopancreatography (ERCP). ERCP's are considered the gold standard for the diagnosis and treatment of positive intraoperative cholangiograms. However, several studies have shown that 40-50% of patients who undergo an ERCP after a "positive" IOC have a normal cholangiogram. Reasons for this include spontaneous stone passage of the stone, dysmotility of the biliary tree, or poor quality, incomplete, or misinterpretation of the IOC. Therefore ERCP's are being performed when they could be avoided. ERCP performance carries significant complications including pancreatitis (5-10%), bleeding, and perforation. Ideally if a safer test to assess the bile duct could be performed immediately prior to the ERCP to confirm the presence of the positive IOC findings, this would ensure that the ERCP is being performed for therapeutic means thus avoiding unnecessary ERCP's.