As per the U.S. Food and medical services, there are two significant sorts of COVID tests: diagnostic and antibody tests.
Diagnostic tests: A diagnostic test can show if you have a functioning COVID-19 disease. These tests can be additionally separated into molecular and antigen tests, the two of which recognize functioning COVID-19 contamination.
Antibody tests:  search for the presence of antibodies against the Covid. Since antibodies can require days or even a long time to create, antibody tests aren't great at testing for dynamic COVID contaminations.