Wondering how much protection you have against COVID-19? There are antibody, or serology, tests that will tell you if your body mounted an immune response. However, the Arizona Department of Health Services warns you not to use antibody testing to assess your immunity and not to use it to get another dose of the vaccine if your antibody level is low or negative. The state said the CDC does not recommend this test for this purpose for a number of reasons. A few are these tests have different sensitivity levels, vary in how specific the results are, and are not authorized to assess your immune response.