The operation of the colloidal gold method of the new crown test reagent roughly has the steps of extracting samples, adding samples for testing and reading the results. The colloidal gold method of the new crown test reagent is the new crown antigen detection reagent. First make sure that the test kit is in the expiration date, disinfect your hands, and prepare the appropriate tools, then pour the sample extraction solution into the extraction tube, the bilateral nostrils with a sampling swab into the nostrils 1.5 cm or so along the mucosa of the nasal cavity rotated four times, and then the swab into the extraction tube rotating and squeezing, the two operations are in more than 15 seconds, and finally to the top of the test card a number of drops of samples. Wait about ten minutes for the result to appear after the drops are taken, during which time retrieve the swab and do not touch the test card. If a bar appears at both C and T, the result is positive; if only a bar appears at C, the result is negative; and if no bar appears at C, the result is invalid. Positive antigen test results should be followed by further nucleic acid testing to avoid delaying the disease.