Antinuclear antibodies are produced by the immune system when it fails to distinguish between its own cells and foreign invaders such as bacteria and viruses. Antinuclear antibodies attack proteins inside the body's own healthy cells and cause symptoms such as inflammation, joint pain and fatigue.
What might a high result mean?
A high level of antinuclear antibodies in the blood may indicate an autoimmune disorder. However, on its own, elevated antinuclear antibodies can’t be used to diagnose a particular autoimmune disorder.