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.
Prior to surgery there are tests that will be necessary in order for the surgeon to determine several things about your health including your gallbladder, it's function, and the presence and location of any gallstones. Tests that may be necessary include: 1  Abdominal Ultrasound. 2  HIDA Scan. 3  ERCP. 4  Bloodwork. 5  Chest x-ray. 6  EKG.