This study aims to compare the diagnostic accuracy of rapid antigen detection tests(RDTs) for SARS-CoV-2 using nasal swab insertion depths of 2 cm versus 4 cm.The study is an investigator-initiated, randomized clinical trial conducted at a publicCOVID-19 test center in Copenhagen, Denmark.Following enrollment, participants complete a questionnaire regarding symptoms andvaccination status.Participants are randomized in a 1:1 ratio to one of two sampling sequences: either a 2cm swab in the left nostril and a 4 cm swab in the right nostril, or vice versa. Allparticipants undergo a healthcare worker-collected throat swab for RT-PCR analysis, whichserves as the reference standard for SARS-CoV-2 infection.