If the first two bars of the new crown antigen test are normal and the second one is normal, it is not certain which result is correct. The new crown antigen test, in general, need to look at the “C” and “T” two positions, if these two positions have a red band, it suggests that it is positive, you need to immediately carry out further nucleic acid testing; when only the “C” position has a band, it means that the test results are negative; if only the “T” position has a band, it means that the test results are negative. When only the “C” position has a band, it means that the test result is negative; if only the “T” position has a line, it suggests that the test is invalid, and need to be tested again. If the test is normal for the first two bars and normal for the second, there may be false positives or false negatives, or it may be caused by irregularities in the procedure. In this case, it is recommended that the local community be contacted immediately to report the situation, and that a new coronavirus nucleic acid test be performed to confirm the diagnosis.