The results of antigen test may be positive, negative or invalid; antigen test usually has two lines, which are C line and T line. 1. Positive: If both the C line and the T line appear to be dark in color, the test is positive and you need to go to the hospital immediately for further examination. 2. Negative: If only C line appears, but no T line is shown, it is negative. 3. Invalid: If the C line does not appear, the result is invalid regardless of whether the T line appears or not, and the test should be performed again according to the instructions. It is necessary to wait for 15 minutes for interpretation and the result after 30 minutes is invalid; if the antigen test is positive, go to the hospital for examination and treatment under the doctor’s guidance, do not delay, so as not to cause delays and serious consequences of the disease.