A dark and light antigen test may be a weak positive test result. Antigen test is a way to test for Neocoronavirus, and there are two lines to identify the test result, the first bar is the C area for quality control area, which is the identification to determine whether the kit is effective; the second bar is the T area, which is the indicator of the area to test for Neocoronavirus, and identifies whether or not Neocoronavirus infection has been detected. If the antigen test is one dark and one light, it can be considered as a weak positive. In an antigen test, the C zone does not show up, indicating that the kit is invalid, and the test result is then considered invalid. If the C zone is displayed and the T zone is not displayed, it means that the new coronavirus test result is negative. If the C-zone is displayed and the T-zone is also displayed, it means the test result is positive; then a dark and light condition can be considered as a weak positive. When there is a test result of one dark and one light, it is necessary to consciously and promptly inform the healthcare institution and take measures such as isolation and simultaneous nucleic acid testing to further clarify the diagnosis. For antigen test paper testing, the results may have errors and false positives. It is recommended to perform the test several times, or go to the medical institution for new crown nucleic acid testing to ensure the accuracy of the test results.