The main tests to be done to prevent liver cancer are blood indicators and imaging tests, but of course the common indicator for hepatitis prevention or control is the blood indicator AFP, or alpha-fetoprotein. If the indicator is above 400 for one month or above 800 for two weeks, the risk of hepatocellular carcinoma is determined, but it should be combined with abnormalities in imaging tests or previous history of liver disease, such as occupying lesions in the liver or metastatic lesions seen under ultrasound or CT. In addition, it can also be combined with liver function tests such as alkaline phosphatase, hepatitis B surface antigen, and the degree of cirrhosis, etc. Therefore, the above tests are the main tests to prevent liver cancer.