evidence: There are three main types of tests for COVID-19 – two are diagnostic (PCR and antigen tests), and one looks for protective antibodies from a previous infection (antibody or serologic tests). [...] Pros: Considered the gold standard for COVID-19, PCR tests are the most accurate form available today. We use PCR tests at nearly all UT Southwestern facilities and to verify whether patients are COVID-free prior to surgery. [...] Cons: The results are less sensitive for COVID-19 and therefore have a higher false negative rate (you may test negative but actually have the virus). The test is very specific, so if it is positive, you have COVID-19. Because of this, antigen testing can be used for rapid screening and can be confirmed by a PCR test if necessary.