Nucleic acid abnormalities can be positive, false-positive, false-negative or specimen abnormalities. 1. Positive: If infected with a virus, a positive result will be indicated by testing the nucleic acids. 2. False Positive: If you are not infected with the virus, but the test result is false positive, it may be caused by contamination of the specimen. 3. False-negative: If the patient has obvious clinical symptoms and relevant examinations, all suggesting that the patient has a viral infection, but through the nucleic acid test is not detected, a negative reaction. 4. Specimen failure: If the specimen of nucleic acid test has not been tested for a long time, it is easy to lead to specimen failure, or specimen overflow in the transportation process, which can not be detected normally. It is recommended to consult a specialist as soon as possible if there are abnormalities in nucleic acids when doing nucleic acid testing, and repeat the test if necessary.