The new crown antigen test results are generally valid in about 15 minutes to read the data results, up to 30 minutes. At present, the new crown antigen test time is relatively short, generally about 15 minutes can produce results, some antigen test results will be longer, but at most no more than 30 minutes, if more than 30 minutes and then read the data may not be valid, the test results may fail, and can not be used as a basis for testing. Antigen detection is mainly based on the C and T two positions of the line to determine, if the two lines are dark and light or both lines are darker, it means positive. If the line at C is more obvious and the T is not red, it mainly represents negative, but if it is only the T line, it means the test is invalid. After choosing the antigen test, it is important to observe the data, once found that the test result is positive need to promptly notify the hospital or community, and improve the nucleic acid test in a timely manner.