How accurate is this test? May 20, 2020 18:16 Updated LabCorp is committed to scientific excellence. You can read about the performance of this test in our FDA Emergency Use Authorization Summary. Other studies have also examined the performance of self-collected nasal swabs. Related articles What is a false negative result? How long does it take to get the test results back? Can I order a test for someone else? How long is my sample stable for testing? How does the Pixel by LabCorp™ process work?