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What is this test?

The Nuclear Antibody (ANA) test is a blood test that detects the presence of anti-nuclear antibodies in your blood. These are proteins (antibodies) produced by your immune system that mistakenly target and attack the nucleus of your own cells. This misdirected immune response is called autoimmunity.

Why might I need this test?

Your healthcare provider may order an ANA test if you have symptoms of an autoimmune disorder, such as persistent fatigue, joint pain or swelling, muscle pain, fever, rash, or unexplained fever. It is commonly used to help diagnose conditions including Systemic Lupus Erythematosus (SLE), Sjögren's syndrome, scleroderma, rheumatoid arthritis, and dermatomyositis.

How is the test performed?

A healthcare professional will draw a small blood sample from a vein in your arm. The sample is sent to a laboratory where it is analyzed using techniques like immunofluorescence to detect and measure ANA levels. Results are typically reported as a titer (a ratio like 1:40, 1:160, etc.) and may include a staining pattern.

What do the results mean?

A positive ANA test indicates the presence of anti-nuclear antibodies, but this does not automatically mean you have an autoimmune disease. Some healthy individuals, especially older adults, may have low-level positive results. Your healthcare provider will interpret your result alongside your symptoms, medical history, and other test results to determine if further testing or treatment is needed.

Are there any risks?

The risks associated with this test are minimal and similar to any standard blood draw, including slight bruising, bleeding, or dizziness. These usually resolve quickly.