1 (If you don't know what these, are set them each to 0.5. 2  z is the value that specifies the level of confidence you want in your confidence interval when you analyze your data. 3  Typical levels of confidence for surveys are 95%, in which case z is set to 1.96. 4  E sets the accuracy of your sample proportions.
A hepatobiliary (HIDA) scan is an imaging procedure used to diagnose problems of the liver, gallbladder and bile ducts. For a HIDA scan, also known as cholescintigraphy and hepatobiliary scintigraphy, a radioactive tracer is injected into a vein in your arm.
Tests Used to Evaluate for Gallstone Disease. 1  Ultrasound â This test uses sound waves to examine the bile ducts, liver and pancreas. It is not invasive and is very safe. Stones may be seen in the gallbladder or bile ducts. Imaging may be impaired in patients who are obese or have recently eaten food.