There are three different ways to test for COVID-19: PCR tests, antigen tests and antibody tests. Here are the differences.

Only a single PCR test is required by comparison. If you need testing more quickly, there are other programs offering free or low-cost tests, including community-based testing sites.

Do you need to test out of isolation? While testing out of isolation is not required, the CDC says those who choose to should use an antigen test and not a PCR test.

For the study, scientists examined data on 348 adults newly diagnosed with COVID-19 based on PCR (polymerase chain reaction) testing.

In general, rapid antigen tests are less sensitive and therefore less likely to detect an infection compared with polymerase chain reaction (PCR) tests. PCR tests look for viral genetic material, ...

How Long Can You Test Positive for COVID-19 Following Infection? When it comes to testing, PCR tests are more likely to continue picking up the virus following infection ...

PCR tests, however, are processed in labs and can take 24 to 48 hours to get a result.

How long does flu show up on PCR? There is some variation in how long PCR tests take to detect flu. It all depends on the specifics of the sample and the test.

How long are you going to test positive for COVID after taking a test? Two experts weigh in, and advise on testing and isolation guidelines to follow.

At-home tests and the omicron variant When the omicron variant emerged in late November 2021, scientists quickly responded to determine how PCR and rapid tests performed against this new variant.