Doing nucleic acid currently generally refers to the new crown nucleic acid test, you can drink water 30 minutes before, nucleic acid test has no special requirements for diet. The new crown nucleic acid test is a means of collecting mucosal secretions from the throat and nasal passages to detect whether or not they are infected with the virus. Drinking water does not kill the virus, and therefore hardly affects the test results. However, if a pharyngeal swab is used for the new coronavirus nucleic acid test, symptoms of dryness, nausea and vomiting may occur. In order to avoid these situations, it is not recommended that sensitive individuals eat or drink water 30 minutes prior to the test. In addition, the new crown nucleic acid should also pay attention to reduce the time spent in the testing site, nucleic acid test is done in a timely manner to leave. In general, we should also pay attention to their own protection, avoid going to crowded places, wear a good mask when going out, and go home to do a good job of disinfection and hand-washing protection measures.