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. 2  X-rays. 3  Computed tomography (CT) scan. 4  Magnetic resonance imaging (MRI) . 5  Endoscopic retrograde cholangiopancreatography (ERCP) . 6  Cholescintigraphy (also called DISIDA, HIDA scan, or gallbladder radionuclide scan).