Antigen testing is a test that is not harmful to the body. However, it can only be harmful if the specimen is taken improperly. Antigen testing is a common method used to determine the presence of viral infections by drawing blood and then detecting the antigen through relevant laboratory methods, and is not known to be particularly harmful to the human body. In addition to local blood sampling operation if not standardized, may cause local skin infection pain, skin ulceration, itching, etc., but this harm is very small. If other specimens are taken, such as pleural fluid, ascites, tissue specimens for testing, if not properly operated, it may cause local bleeding, infection, etc.. It is recommended to go to a regular hospital for antigen detection and standardized operation by a professional doctor.