New Crown Antigen Detection Kit becomes two bars after a long time, which is a manifestation of the failure of the antigen results and has no clinical diagnostic effect. The rapid determination of antigen has a period of effective observation, that is, the expiration date. In general, observations can be made within 10 minutes of using the antigen kit, preferably not more than 30 minutes. False positive results may occur beyond 30 minutes. Those who have a need to record should take a photo sample within the expiration date. There is no point in continuing the observation after too long as the expiry date has passed. If the test result is negative, then the general public can wrap it in the ziplock bag included in the kit and dispose of it as trash. Isolated observers, on the other hand, use the sealed bag to dispose of it as medical waste. It is recommended that the nucleic acid test should be carried out in a timely manner at the hospital, and not to cause misdiagnosis by doing it privately.