How soon a diagnosis of novel coronavirus can be confirmed usually depends on the early detection of the suspected patient and the completion of the appropriate tests. After a novel coronavirus infection, it usually takes 1-2 days to confirm the diagnosis of novel coronavirus infection, as these tests usually require routine blood tests and chest CT, and the results of these tests are available within 1 day, while nucleic acid testing of respiratory specimens for novel coronavirus usually takes 1-2 days. However, it is important to note that some patients may require 2-3 or more tests to become positive for novel coronavirus nucleic acid testing, at which point the time to confirm the diagnosis may be appropriately prolonged. Some patients with mild disease may only have low fever and general malaise without obvious characteristic changes, which may lead to misdiagnosis or omission, and the time to confirm the diagnosis may also be extended. Therefore, patients with epidemiological history should be examined early as a high-risk group to avoid misdiagnosis and early diagnosis of novel coronavirus infection.