How deep do I need to go in my nostril to collect the sample? November 01, 2021 12:00 Updated You only need to swab the edge of your nostril. Do not insert the swab too deep. You can view our sample collection video here. Related articles How long is my sample stable for testing? How long does it take to get Pixel by Labcorp® COVID-19 or Pixel by Labcorp® COVID-19 + Flu test results back? What happens if I don’t collect my sample correctly? Is it safe to send my sample in the mail? When will I receive my kit?