Nucleic acid double-collection double test is a test method, refers to the sampling, while taking two different samples from the subject placed in the same tube, a total of two tubes collected, and then sent to test separately to prevent false positives or false negatives. For example, for nucleic acid testing of the new coronavirus, double collection means collecting two types of specimens, nasopharyngeal swabs and oropharyngeal swabs, respectively, and placing both in the same sampling tube, collecting a total of two tubes for parallel testing at two different nucleic acid testing facilities for the new coronavirus, or testing with two nucleic acid testing reagents for the new coronavirus at the same facility, respectively. A false positive is, as the name implies, a result that should have been negative but was tested positive; a false negative indicates a result that should have been positive but was tested negative. False-positive or false-negative results are usually related to the physical state of the subject, the environment and the process of the test, etc. The probability of occurrence is generally low, but it can cause some problems for disease prevention and control or treatment. Generally false positive results will be dealt with according to the positive results of the disease, further improve the examination, isolation, treatment, etc.. False negatives, on the other hand, are very likely to be missed, which is detrimental to the treatment of the disease and affects the prevention and control of major diseases. For people in high-risk areas, or those who have close contact with infected people generally use nucleic acid double-testing to prevent missed diagnoses. If the local policy requires dual nucleic acid testing, there is no need to worry and it is recommended to cooperate well to protect your health.