The depth does not need to be too deep when poking the nose for the new crown antigen self-test. In the case of nasal swabs, for example, nasal swab sampling can be done on your own for people over 14 years of age. First, the nasal swab should be carefully unpacked, avoiding hand contact with the swab head. Then, with the head slightly tilted, one hand holds the end of the swab against one nostril, and slowly extends 1-1.5 cm backward along the bottom of the inferior nasal passage, then rotates the swab against the nasal passage at least 4 times. For 2-14 year olds, the procedure is the same as above, but the depth is reduced, i.e., the swab is slowly inserted 1 cm backward along the base of the inferior nasal passage and then rotated at least 4 times (for at least 15 seconds) against the nasal cavity. Therefore, the depth of the nasal swab does not need to be too deep, and the test can be performed strictly according to the instructions of the antigen detection kit. However, it should be noted that the sampling process should be maintained for 15 seconds or even more to avoid insufficient sample collection to affect the accuracy of the results, resulting in false negatives.