This test does not differentiate between SARS-CoV and SARS-CoV-2 viruses, so you may receive a positive result but have a different coronavirus that does not cause COVID-19.
It is possible to test a person too early or too late during COVID-19 to make an accurate diagnosis. The amount of antigen in a sample may decrease as the duration of illness increases. Negative results from patients with symptom onset beyond 5 days should be treated as presumptive and confirmed with a molecular assay, if necessary, for patient management.
Improper handling of the test kit not according to guidelines may yield imprecise test results.
When an incorrect result is suspected, it is important that you engage with your healthcare provider to help you understand the situation and evaluate your next steps.