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.
Tests and diagnosis discussion for Gallstones: Many gallstones, especially silent stones, are discovered by accident during tests for other problems. But when gallstones are suspected to be the cause of symptoms, the doctor is likely to do an ultrasound exam. Ultrasound uses sound waves to create images of organs.
Tests Used to Diagnose Gallbladder Problems. Gallbladder problems are diagnosed through various tests. Liver tests (LTs), which are blood tests that can show evidence of gallbladder disease. A check of the blood's amylase or lipase levels to look for inflammation of the pancreas. Amylase and lipase are enzymes (digestive chemicals) produced in the pancreas.