Autoantibody tests look for immune proteins that react with a person’s own tissues.
Antibodies are immune proteins that usually recognize outside targets. An autoantibody reacts with a person’s own cells or tissues. Blood tests can look for particular autoantibodies when an autoimmune condition is being investigated.
Usually not by itself. Different autoantibodies have different meanings, and a result may support diagnosis or monitoring only in the right clinical setting. The specific test, symptoms, examination, and other results all matter.

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