Currently, gallstones are mainly examined by other imaging such as ultrasound, and these tests usually provide a good view of gallstones. Gallstones can be very dense due to the formation of tightly packed components such as cholesterol or bile pigments. They are usually well detected by imaging. The most widely used and effective examination is color ultrasound. During the ultrasound examination, it is possible to detect calcifications that are gathered in clusters in the gallbladder and bile duct, and these calcifications are judged to be gallstones when they move with the change of body position during the examination. This means of examination is not only sensitive but also relatively inexpensive, so it is most suitable for the examination of gallstones. Abdominal CT and MRI are also good for determining gallstones. These tests can not only detect gallstones, but also determine whether there is inflammation of the gallbladder or bile ducts. Some stones are located in the lower portion of the common bile duct, and imaging can also assist in the diagnosis of obstructive jaundice by determining the degree of bile duct dilatation. Gallstones can cause obstructive jaundice, and the severity of jaundice is measured primarily by the level of bilirubin. Checking the bilirubin value requires a liver function test, a test that can give a clear indication of the level of elevated bilirubin. Gallstones are a relatively common condition and the current tests are fully adequate to diagnose this disease.