![]() Antibodies can be in your blood from either past infection or vaccination. Testing for past infection Antibody testsĪntibody tests, also called serology tests, look for antibodies in your blood that fight the virus that causes COVID-19. For more information, visit At-Home COVID-19 Antigen Tests-Take Steps to Reduce Your Risk of False Negative: FDA Safety Communication.įor more information on rapid tests that can be done at home, visit COVID-19 Self-Testing. Many of these tests are designed to be used doing multiple tests in a row, 24 to 48 hours apart.
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