The new crown antigen test takes about 15-20 minutes. The procedure is to first insert the nasal swab head deep into the nasal cavity, rotate it 5 times, both nasal cavities need to be sampled, then place the sampled nasal swab in the preservation liquid of the sampling tube, rotate it for 30 seconds, gently squeeze the swab head by hand for 5 times, and then finally cap the sampling tube, the liquid will be dripped vertically into the sample holes of the test card, and then wait for the test result, the process will take about 15~20 minutes. If the new crown antigen test C and T will show a red or purple band, on behalf of the antigen test results for the positive, if the C will show a red or purple band, T does not show a band, on behalf of the antigen test for the negative, if the new crown antigen test C and T do not show a red or purple band, proving that the test results are invalid, you need to re-test. It is recommended to perform the new crown antigen test regularly, and if there is any abnormality, you should consult a doctor immediately to improve the nucleic acid test.