Infection with neocoronavirus can usually detect nucleic acid in 3~7 days, but some patients can extend to 14 days before they can be tested positive for nucleic acid. Since the incubation period of neocoronavirus pneumonia is about 1~14 days, mostly 3~7 days based on the current epidemiologic investigation study of neocoronavirus pneumonia, infection with neocoronavirus can generally be detected as nucleic acid-positive in 3~7 days, but some patients can extend to about 14 days to be detected. The basis for laboratory testing to confirm a diagnosis of Neocoronavirus in China is based primarily on a positive nucleic acid test for Neocoronavirus. Half an hour before nucleic acid sampling, try to avoid drinking and eating so as not to affect the results. The professionalism of the sampling personnel can also ensure the accuracy of the test results. Tip: In this article, the terms “new coronavirus pneumonia” and “new coronavirus pneumonia” were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.