In USG scan of the liver, high-frequency sound waves are used to create a live image from inside of a patient’s body. It is a painless, non-invasive test which is very commonly used in the medical field. The USG scan makes the use of sound waves instead of radiation and is considered a safe scan. The method is quite often used during pregnancy. A USG scan diagnoses problems which are related to soft tissue, blood vessels, and internal organ structures within the body. Although it is most commonly used during pregnancy, it is also used to examine various other parts of pancreas, kidneys, bladder, liver, gallbladder and many other internal structures.