Generally speaking, the new crown antigen test has a certain degree of accuracy, but not as high as the nucleic acid test. Compared with nucleic acid testing, antigen testing is characterized by a more convenient testing process, and can produce results more quickly, usually only takes about 10 minutes to produce results. However, the sensitivity of antigen test is relatively low, and the operation is not standardized may lead to the risk of erroneous results, in some cases can only play an auxiliary role, and can not be used as a basis for diagnosis, nor can it replace the results of nucleic acid test. Therefore, it can be said that the antigen test is not accurate enough. If both “C” and “T” are purplish-red, it is a positive result, but it is not definitively positive, and should be reported immediately to the community, and further nucleic acid testing should be performed at a relevant institution.