It can change the next day after the last sampling at home. According to relevant public information, nucleic acid testing is usually done twice in the first three days and once on the last day. The results will be available the next day after collection and accounting. If the isolation period expires and the nucleic acid test results are negative, the control can be lifted. For some people in home isolation, home health monitoring and observation may continue to be implemented for 7 days. A nucleic acid test will be conducted on the second and seventh days of home health observation. If the results are negative, the home health observation can be ended.