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.
Imaging tests used to diagnose gallbladder problems include: 1  An ultrasound. This is the most commonly used of the diagnostic tests for gallbladder problems. 2  X-rays. An abdominal X-ray can spot gas and some types of gallstones containing calcium. 3  Computed tomography (CT) scan.