What is a polymerase chain reaction (PCR) test? Here, we describe how the tests work and why health experts and researchers use them.

We've been talking about PCR tests to detect COVID-19 for almost two years now. Here's a look at how they're processed, and how to get more accurate results.

How to get a molecular/PCR test Outside of your home, your main options now are urgent care clinics and places that do testing for travel. In both cases, they’ll be expensive. In the case of urgent ...

There’s a big difference between the standard at-home antigen test and a molecular (PCR or NAAT) test. Molecular tests are the ones you want when accurate testing is important. Here are four ...

While PCR tests can be highly sensitive at detecting cases of the virus, health authorities caution that people can continue to trigger positive PCR test results for weeks or even months after ...

Antigen and PCR tests diagnose COVID-19. Read about how these tests differ in their method of determining results, accuracy, timing, skill requirement, and costs.

Physicians should practice clinical judgment when treating patients who have a negative PCR test despite clear COVID-19 signs or symptoms and no alternative diagnosis, according to researchers ...

If a rapid test produces a negative result but you have a cough, fever or other symptoms, the CDC recommends you also do a PCR test.