Nucleic acid test can eat breakfast. Nucleic acid test is mainly to determine whether there is a virus present in the body, nucleic acid test is not affected by food, you can have a normal breakfast before doing the nucleic acid test, there will be no food to affect the final results of the nucleic acid test. Nasal swabs, throat swabs and sputum are common specimens used for nucleic acid testing, but blood or feces can also be used. If the nucleic acid test result is positive, it indicates the presence of the virus in the body and requires prompt and targeted treatment by a doctor. If the result of the nucleic acid test is negative, it indicates that the virus has not been detected in the body for the time being, but the virus may have a certain incubation period in the body. If there is direct or indirect contact with the infected patient, it is recommended to do the nucleic acid test several times, and there may be a situation that the nucleic acid test is positive after several times.