There are a number of different ways to test for COVID-19 in the body, with the most common and easy to perform tests being the RT-PCR and the RTK-Antigen tests, also known as diagnostic tests. Another form of testing is called the antibody test. Diagnostic tests such as RT-PCR and RTK-Antigen are able to show if you have an ACTIVE infection of COVID-19. Antibody tests on the other hand shows if you had a PAST infection of COVID-19. The main types of COVID-19 tests that are commonly used in Malaysia are the RT-PCR test and RTK-Antigen test.