Nucleic acid testing generally refers to new coronavirus nucleic acid testing. The 24-hour interval between two nucleic acids is generally counted from the time of sampling, and the interval between two tests needs to be 24 hours, please refer to the local policy. The time point of nucleic acid test in general needs to be counted from the sampling time. If the interval of 24 hours is required to do two nucleic acids, that is, the first day of nucleic acid test sampling time is counted from the first day of sampling to the end of the sampling time of the second nucleic acid test, the sampling time is used as a reference. If the first day is sampling at 8:00, then the next day after 8:00 to sample again, only to be considered an interval of 24 hours, so in the nucleic acid test need to pay attention to their own time, to avoid unnecessary trouble caused by not meeting the requirements.