A positive antigen test and a negative antigen test are usually considered false positives and false negatives, and several repeated tests are needed to confirm the results. Antigen testing detects whether a subject is infected by the combination of antigen and antibody on a test strip. Whether or not the testing process is standardized, the number of viruses carried by the subject, and the history of various types of medications all affect the accuracy of the antigen test and may lead to false-positive and false-negative results, which are reasonable error results in the design of the antigen test. In the event of completely different antigen test results, subjects can choose to repeat the antigen test several times to confirm the infection results, or they can choose more accurate testing methods such as nucleic acid testing or blood sample analysis for further examination. The accuracy of the test results can be improved by repeating the test several times. In the event of a false result, there is no need to be overly alarmed and further testing can be done to confirm the diagnosis.