Antigen generally refers to the Neocoronavirus antigen test, which is negative if it shows a single bar at C and no color at T. The absence of a red band at C and only a single bar at T suggests that the test is invalid and needs to be retested. New coronavirus antigen test can be judged after 10 to 15 minutes, usually less than 30 minutes, C and T both show a red band (i.e., “two bars”) is positive, C shows a red band and T does not show a red band is negative, C does not show a red band, regardless of whether T shows a red band or not, it suggests that the test is invalid and needs to be re-tested. If no red band is shown at C, regardless of whether a red band is shown at T or not, the test is invalid and needs to be re-tested. To operate in strict accordance with the instructions of the manual, the operation is not standardized, the number of drops of the extraction solution is not enough, the number of drops are too many may cause “false negative”, the new coronavirus antigen test, you need to operate in accordance with the instructions of the manual standardized operation, do not be negligent, so as not to affect the results of the test.