There is a high probability that the antigen test will be positive with two bars and further nucleic acid testing will be required. If the test is conducted in strict accordance with the antigen standard and the kit is qualified, there is a high chance that the antigen test will be positive with two bars. However, the antigen test does not provide a final diagnosis, and the patient will need to undergo nucleic acid testing to further clarify the diagnosis. If the test is not performed according to the antigen test criteria, such as the specimen is not taken properly, the reading time is too long, or the antigen kit is not qualified, etc., it is also possible that the results will be inaccurate, resulting in two bars. In this case, it is necessary to reuse qualified kits and adopt the correct operation method to re-test in order to make the test results more accurate. It is important to note that when two bars are detected in the antigen test, it is recommended to report the case as soon as possible and undergo further nucleic acid testing to clarify the results for prompt treatment.