The antinuclear antibody (ANA) test is a blood test used to detect autoantibodies that are present when someone has an autoimmune disorder. ANA tests can be used to help diagnose some of the most common autoimmune diseases, including lupus, rheumatoid arthritis, and Sjogren's syndrome.
What Does ANA Test For?
The ANA test looks for autoantibodies in the blood that attack the body's own cells and tissues. Autoantibodies are proteins produced by the immune system that mistakenly attack the body's own healthy cells and tissues. Autoimmune diseases occur when the immune system is unable to distinguish between healthy cells and foreign invaders, such as bacteria and viruses.
Does a Positive ANA Test Mean I Have an Autoimmune Disease?
A positive ANA test result does not necessarily mean that someone has an autoimmune disorder. A positive result merely indicates the presence of autoantibodies in the blood. Additional tests may be needed to confirm a diagnosis of an autoimmune disorder.
What Else Could Cause a Positive ANA Test?
Some medications, such as certain antibiotics, can cause a false positive result on an ANA test. Other medical conditions, such as certain types of hepatitis, can also cause a false positive result. In addition, the presence of autoantibodies in the blood does not necessarily mean that someone has an autoimmune disorder.
The ANA test is an important part of diagnosing autoimmune diseases, but it is only one of many tests that may be necessary to make a diagnosis. If you have received a positive ANA test result, it is important to talk to your doctor about your symptoms and any other tests that may be necessary to confirm a diagnosis.