Antigen test c dark t light may be false positive or weak positive, it is recommended to review the test again to avoid the situation of error results. Antigen test generally refers to the antigen test of the new coronavirus, which mainly examines the protein on the surface of the new coronavirus, so as to clarify whether there is an antigen-antibody reaction. The test is performed by taking secretions from the patient’s nasopharyngeal and oropharyngeal swabs, dissolving them in buffer, and dropping the liquid into a test card to detect a positive result. If the antigen test is c-dark and t-light, it may be a false positive, or it may be a weak positive test result for the possibility of infection with the new coronavirus, and retesting is recommended. If the second test result is c deep t absent, it means that there is no infection with Neocoronavirus. However, if the second test is still c deep t light, the possibility of infection with the new coronavirus needs to be considered. It is recommended that the patient go to the local immunization agency and undergo nucleic acid testing to determine the cause of the disease. Once the diagnosis is positive, the patient should actively cooperate with the doctor to take relevant treatment measures to avoid delaying the condition.