The shorter the ideal validity period of negative results of nucleic acid detection, the safer it is. But if it is too short, it needs frequent detection, which is difficult to operate in reality.
The validity period is limited to 7 days, which is mainly determined according to the COVID-19 incubation period method. The incubation period in COVID-19 is usually 3 to 7 days, some people are less than 3 days, some people are more than 7 days, and the longest incubation period is 14 days. Therefore, 14 days is set as the observation period for close contacts.
If all aspects of nucleic acid detection can be accurate, the accuracy of nucleic acid detection can reach more than 95% in an ideal state. However, due to various reasons, there will be false negative results. The so-called false negative means that the subject is really infected, but the nucleic acid test result is negative, which is a false negative. With the improvement of technical level, the accuracy of medical institutions is increasing rapidly, and the false negative rate is decreasing.
Matters needing attention in nucleic acid detection:
1. The appointment for nucleic acid testing serves people who have no symptoms such as fever and no epidemiological history and voluntarily accept nucleic acid testing. People with fever, cough, sore throat and other symptoms should go to the fever clinic for screening in time.
2. For your own safety, please make an appointment on demand, make an appointment at the wrong peak, and wear a mask to avoid getting together and cross infection.
3. Please bring your ID card and social security card to see a doctor, cooperate with the hospital's pre-inspection and triage work, scan the "health code" and truthfully declare your personal health status; Please always wear a mask and keep a social distance of one meter.
4. No fasting is required for nucleic acid collection, and no smoking, drinking or chewing gum is allowed for 2 hours before sampling; For pharyngeal sensitive person, it is recommended not to eat within two hours before sampling to avoid nausea and vomiting when collecting throat swab.
Refer to the above? Jiangnan University-How high is the accuracy of nucleic acid detection? Why is the negative result valid for 7 days?