A molecular test, such as the Visby Medical Respiratory Health Test, detects the presence of a virus’ genetic material (SARS-CoV-2 RNA, influenza A and/or influenza B) to help identify infection. An antigen test detects specific proteins of the virus (SARS-CoV-2 RNA, influenza A and/or influenza B). Antigen tests also help to identify an active infection, but are generally less sensitive than molecular tests. An antibody test detects the presence of antibodies to viral antigen, the body’s immune response, to a virus. According to the CDC, “Serologic (antibody detection) testing is not recommended for routine patient diagnosis and cannot inform clinical management.”
https://www.cdc.gov/coronavirus/2019-ncov/hcp/testing/antibody-tests-guidelines.html