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.
A gallbladder scan is a nuclear scanning test that checks to see how your gallbladder is working. The scan can find blockage in the tubes (bile ducts) that lead from the liver to the gallbladder and small intestine (duodenum ). During a gallbladder scan, a radioactive tracer substance is put into a vein in the arm. The liver removes the tracer from the blood and adds it to the bile that normally flows through the bile ducts to the gallbladder. The gallbladder then releases the tracer into the first part of the small intestine.