Nucleic acid test generally refers to the new crown nucleic acid test, which consists of a nasal swab and a pharyngeal swab, where specimens are taken from the nostrils (the swab goes deep into the nasopharynx) and throat respectively for testing. 1. Nasopharyngeal swab test: A sampling tool is delivered into the nasal cavity to collect nasal secretions as specimens for testing, which can be used for sampling during routine screening. 2. Oropharyngeal swab test: the sampling tool will be sent into the oral cavity to collect oropharyngeal secretions as specimens for testing, for testing the application of more and more widely, belonging to a large range of population screening methods. The decision of which method to choose for the new crown nucleic acid test is based on the subject’s personal situation and related symptoms, and it is usually recommended to listen to the doctor’s advice for the test.