The antigen test is invalidated for more than 30 minutes, and the kit should be reused for testing. General antigen detection in the collection of specimens have been operated as soon as possible after the interpretation of the results, if more than 30 minutes, it may lead to errors in the results or failure, if this situation should be re-tested. If it takes more than 30 minutes for the antigen test to be invalidated, the results cannot be interpreted, otherwise the clinical diagnosis will be affected, and it is recommended to either reopen the test or go to the hospital for testing at this time. At present, the antigen test of the new coronavirus can be tested at home, and it is recommended to follow the instructions strictly. If the operation is not clear, it is recommended to go to the hospital for nucleic acid testing.