The Food and Drug Administration (FDA) issued guidance last week saying that antibody tests should not be used to check COVID-19 protection at any time.

A recent study found that the Moderna COVID-19 vaccine produces higher antibody levels than the Pfizer-BioNTech vaccine.

Monoclonal antibody therapy targeted therapy that can be used to treat colon cancer and other cancers. Find out about how it works and side effects.

A scientific panel has released recommendations on when someone should get an antibody test for COVID-19.

New research from Eli Lilly and Regeneron show the brands' monoclonal antibody treatments for COVID-19 may be even more effective than previously thought, but the criteria for taking these drugs is still quite strict.

Antibodies only tell part of the COVID-19 immunity story. In-lab blood testing is usually needed to test T-cells but that could change.

Testing for lupus is often done through a series of laboratory tests that, along with your symptoms, help your healthcare provider begin to formulate a diagnosis.

Testing antibody levels may help determine someone's protection level.

From medications to vaccines, there are a number of COVID-19 treatments in development and in clinical trials. Learn the data behind them.

Learn about the thyroid peroxidase antibody test, a blood test that is used to indicate if you have an autoimmune thyroid condition.