Before revision: Scientific basis and underlying biology Antigen tests and antibody tests are often immunoassays (IAs) of one kind or another, such as dipstick IAs or fluorescence immunoassays; however, RAT is an immunochromatographic assay which gives visual results that can be seen with the naked eye .
After revision: Scientific basis and underlying biology RATs are immunochromatographic assays which give results that can be seen with the naked eye .