March 9, 2022

What is the limitation of the NAAT (PCR-like) test?

The test can remain positive for longer periods of time than the rapid antigen. So even after you are no longer infectious, the NAAT can still pick up remnants of the virus genetic material and be positive for weeks after infection.

This is one of the reasons that Health Canada  does not require an individual to repeat a NAAT (PCR) up to 180 days from their initial positive test.