Nucleic acid antigen refers to the New Crown Pneumonia Virus antigen test, antigen test test paper put for a long time to become two bars may be false positive results, antigen test reading results are recommended to be within 10 to 15 minutes. New Crown Nucleic Acid Antigen Test results, with timeliness, speed and ease of use, which are the characteristics of antigen testing. The antigen test needs to look at the results within 10~15 minutes after adding the sample solution. The latest time to look at the results should not be more than 30 minutes. If there is a change to two bars after 30 minutes, it may be a false positive result and it is not effective to check antigen test results beyond the time limit. When a patient has a two-bar nucleic acid antigen test, he or she must immediately wear a mask while keeping a distance from those around him or her. The results are reported to the community at the first opportunity, and the nucleic acid test is scheduled and referred to the administrator for proper regulation of the test. Antigen testing is a complementary means to nucleic acid testing. The results of self-assessment of antigen testing cannot replace the results of nucleic acid testing, which is the basis for confirming the diagnosis of a new crown. [Tip] In this article, “new coronary pneumonia, new coronary virus pneumonia”, etc., has been December 26, 2022, the National Health Commission issued a notice to change the name to “new coronary virus infection”.