Nucleic acid pending means that you need to wait for another nucleic acid test to verify the results. False positives are possible with nucleic acid testing and retesting is required to ensure accuracy. In the case of a mixed nucleic acid test, if a positive result occurs in the initial screening, the test will be reported gradually according to the preplanning process, and all persons tested in the mixed test will be retested again and sent to the local CDC for review and confirmation. Nucleic acid testing is performed multiple times in order to verify whether a person is positive for infection. It takes time for the virus to proliferate in the body, and if the concentration of virus in just the body does not reach the detection limit, it may not be detected. In addition, there may also be a problem with sampling during nucleic acid testing, resulting in an incorrect specimen. The result can only be judged positive if both the initial screening and review test results are positive. If the result of the review test is different from the initial test, further sampling and testing is needed to draw a conclusion.