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What is this test?

The Antinuclear Antibody (ANA) test is a laboratory blood test that detects the presence of antinuclear antibodies in your blood. These are proteins (called antibodies) produced by your immune system that may mistakenly target and attack the nucleus of your own body's cells. Normally, your immune system protects you from infections and harmful substances, but in some people, the immune system can become confused and start attacking healthy cells.

How is the test performed?

A healthcare professional will draw a small sample of blood from a vein in your arm using a needle. This blood sample is then sent to a laboratory where it is analyzed for the presence of antinuclear antibodies. The test results are typically reported in two ways: as a titer (a measure of how diluted the blood can be and still detect antibodies) and as a staining pattern (how the antibodies appear under a microscope).

What do the results mean?

A positive ANA test result indicates that antinuclear antibodies were detected in your blood. However, a positive result does not automatically mean you have a disease. Many healthy people, especially older adults, may have low levels of antinuclear antibodies without any illness. Your doctor will interpret your result along with your symptoms, medical history, and other test results to determine if further investigation is needed. If the ANA test is positive, additional tests such as specific antibody panels (like anti-dsDNA, anti-Sm, anti-RNP, etc.) are often ordered to help identify the specific autoimmune condition.