PCR Tests detect genetic material from the virus SARS-CoV-2 which causes the disease Covid-19. RT-PCR and Express RT-PCR tests are considered the gold standard when it comes to accurately testing Covid-19 and are accepted in every country for international travel.
While PCR tests can accurately detect current infection, it’s not as fast as the rapid antigen test. Typically an Express PCR test takes 6 hours, while the regular PCR test takes 24 hours. Both tests are accepted for all international travel except China/Hong Kong.