![]() A positive test indicates current infection. Antigen tests are immunoassays that detect the presence of specific viral proteins, called antigens.Most NAATs produce qualitative (positive/negative) results. ![]() Most NAATs need to be performed in a laboratory, although some are performed at the point-of-care. Therefore, NAATs should not be used to test someone who has tested positive in the last 90 days. Viral RNA may stay in a person’s body for up to 90 days after they test positive. PCR tests are the most common type of NAAT used for COVID-19 testing.
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