An antigen test that starts with one bar followed by two bars may be positive or may be caused by a testing error. Antigen test just started with one bar followed by two bars, if the time is within the valid range, it means that the interpretation of the result is positive, indicating infection with a certain pathogen, it is recommended that you should go to the hospital. If this is beyond the valid range of the antigen reagent test, the test is in error and should be repeated. If there is no way to make a judgment, it is recommended to go to the hospital under the guidance of a professional doctor for nucleic acid testing, the results of nucleic acid will be more accurate.