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.
Gallstones: Causes, Symptoms and Treatments. Gallstones are stones or lumps that develop in the gallbladder or bile duct when substances in there harden. Some of the chemicals which exist in the gallbladder, such as cholesterol, calcium bilirubinate, and calcium carbonate, solidify into either one large stone or several small ones.