Nucleic acid testing refers to the new coronavirus pneumonia nucleic acid test, and there is no such thing as the three major contraindications. During the epidemic, nucleic acid testing was a measure to find out whether the nucleic acid of the virus was present in the respiratory specimens, blood, and feces of patients to determine whether they were infected by the new coronavirus. There are no three major contraindications before nucleic acid testing, but there are a few points to note before testing: 1. Nucleic acid testing should not be done until 48 hours after vaccination against the new coronavirus. 2. Avoid eating too much 2 hours before sampling to avoid irritating the throat and causing vomiting during sampling. Avoid drinking water and beverages, alcohol or chewing gum half an hour before sampling. 3. When queuing up, don’t go forward immediately after the person in front of you has finished collecting samples, keep a safe distance and wait for the doctor to finish sterilizing his hands and take out new swabs before taking off the mask and opening the mouth for sampling. It is recommended to go to a regular hospital or nucleic acid testing site to do nucleic acid, usually also need to pay attention to cold and warmth, prevent colds, try to avoid high school risk areas, develop good habits, insist on going out to wear a mask, go home to do a good job of hand disinfection and replacement of masks. [Tips] This article refers to the “new coronavirus pneumonia, new coronavirus pneumonia”, etc., has been December 26, 2022, the National Health Commission issued a notice to change the name to “new coronavirus infection”.