evidence: Molecular tests. These tests look for genetic material from the COVID-19 virus. [...] PCR tests are more accurate than the other type of COVID-19 test, called an antigen test. PCR tests may be done at home. But they are much more likely to be done by a healthcare professional and processed in a lab. [...] Antigen tests are reliable and accurate, but they are less accurate than PCR tests. This is especially true if you don't have symptoms. If you take an antigen test and are negative for COVID-19, take another antigen test after 48 hours to get the most accurate result.