When a patient is considered to have a possible novel coronavirus infection, routine blood tests, calcitoninogen, nucleic acid, and other relevant tests need to be completed. If the patient has two consecutive negative tests for nucleic acid, clinically novel coronavirus infection is excluded. If the patient has two consecutive positive tests for nucleic acid, the diagnosis of novel coronavirus infection can be confirmed. When a patient has a history of epidemiological exposure, such as contact with a suspected or confirmed patient, and presents with clinical manifestations related to fever, malaise, sore throat, diarrhea, etc., the likelihood of novel virus infection is high and the above tests need to be completed to clarify the diagnosis. Patients diagnosed with novel coronavirus infection need to be isolated and treated specifically.