Antigen testing generally refers to neocoronavirus antigen testing, and neocoronavirus antigen test results usually expire after 30 minutes. New Coronavirus antigen test refers to the detection of the antigen of the virus with an antibody that allows the virus to show up, so as to determine whether or not a new coronavirus infection has occurred. According to the NeoCoronavirus antigen test kit instructions, the antigen test result will come out about 15 minutes after the sample is dropped into the test card, and the result will be valid for 20 to 30 minutes, and the result will be invalid if you check the result after 30 minutes. The results should be read and photographed as soon as possible within 30 minutes of the test result. The advantage of rapid antigen testing over nucleic acid testing is that it is more convenient and does not need to rely on complex instrumentation like nucleic acid testing. Nucleic acid testing requires multiple amplification of the nucleic acid fragments, which can take as little as 2 to 6 hours, whereas rapid antigen testing requires only 10 to 20 minutes to produce results. However, it is important to note that the results of the novel coronavirus antigen test cannot be used alone for the diagnosis of novel coronavirus infections, and further nucleic acid testing should be performed on suspected patients with appropriate clinical symptoms, regardless of whether the antigen test is positive or negative.