Nucleic acid testing is to detect the presence of viral DNA, ribonucleic acid in samples such as blood or respiratory tract, hence the name nucleic acid testing. Nucleic acid testing is a test for viral DNA, ribonucleic acid, and is generally used to detect hepatitis B, hepatitis C, and HIV, and is now mostly used for new coronavirus testing. The test can clarify whether there is a virus in the blood or respiratory sample, and determine whether there is a pathogen infection, with high sensitivity and relevance. Nucleic acid testing is generally done by taking throat swabs, nasal swabs, and if necessary, anal swabs or sputum swabs from the examinee. Taking Neocoronavirus as an example, if the result of nucleic acid test is negative, it generally indicates that the patient is not infected with Neocoronavirus, whereas a positive result indicates that the patient has been infected with Neocoronavirus and needs to be quarantined. Personal protection is required before the nucleic acid test, and immediately after the test, wear a good mask and do not stay at the testing site to prevent infection.