1. Generally speaking, the time for the second COVID-19 nucleic acid test is at least 1-3 days from the time for the first COVID-19 nucleic acid test. At present, due to the characteristics of strong infectivity and short incubation period, it is stipulated that the second nucleic acid test should be carried out within 72 hours, and the second nucleic acid test can only be carried out after 24 hours.
2. If you have a history of contact with COVID-19-infected people, the first nucleic acid test is negative, and then if the patient has symptoms, you can do nucleic acid testing at any time; If there are no symptoms, the second nucleic acid test should be carried out before the isolation is lifted, that is, when 14 days expires.
Whether the interval of nucleic acid detection is 24 hours refers to the time after sampling or reporting, which is subject to the time shown by the first nucleic acid detection.
If the nucleic acid test shows that it is 3 minutes after 14, that is, the new nucleic acid test can only be carried out after 3 minutes after 14 the next day at the earliest, but in the following cases, the following time shall prevail:
1.24-hour nucleic acid test report will show the time, in principle, the time shown on the nucleic acid report shall prevail.
2. If the 24-hour nucleic acid test report shows both the sampling time and the testing time, the earlier time shall prevail. Therefore, for nucleic acid reports showing both sampling time and detection time, the sampling time shall prevail.
3. If the specific time is not displayed on the 24-hour nucleic acid test report, the effective time shall be calculated from 0: 00 on the day when the report is displayed.
What happens to the second nucleic acid in less than 24 hours? There is nothing particularly harmful.
COVID-19 did a second nucleic acid test every 24 hours, mainly to determine whether COVID-19 was infected. However, due to improper operation, laboratory conditions and other reasons, the results may be false negative, so multiple nucleic acid detection is more accurate.
In addition, there is a certain intermittent period of COVID-19 virus replication, which means that patients may be in the incubation period in the early stage of COVID-19 infection. At this time, the viral load is small, and the nucleic acid test is false negative. After a period of time, the virus replication increases, so it is more accurate to carry out nucleic acid detection, especially for people who have had close contact or are in high-risk areas. The nucleic acid detection should be negative at least twice, with an interval of at least 24 hours, and then different samples should be used for testing. If there are special circumstances, it is more accurate to carry out nucleic acid detection.
Therefore, nucleic acid testing is usually not done twice a day, but if the second nucleic acid is less than 24 hours, it is not harmful to the body, but there is also the risk of cross-infection in the process of nucleic acid testing. It is not recommended to do unnecessary nucleic acid testing multiple times.
4 How many times does the nucleic acid test have to be done to make sure there is no problem? The number of times nucleic acid testing needs to be done varies from person to person.
1, for the general public, people with no obvious epidemiological history, nucleic acid testing is generally done once.
2. For people who have a life history in epidemic areas and a close contact history in COVID-19, and asymptomatic infected people in COVID-19, during the period of centralized isolation, it is usually necessary to carry out two or more nucleic acid tests, that is, after the first nucleic acid test is negative, it is tested again at intervals of more than 24 hours, and the third nucleic acid test can be carried out when necessary.
3. After COVID-19's disease patients are cured, they need to have more than two nucleic acid tests before they can be discharged.