Fluorescent Immunoassay for Antinuclear Antibodies (ANA) in Serum

Why This Test Is Done

Your doctor may order this test if you have symptoms like joint pain, unexplained fatigue, rash, or other signs of an autoimmune disorder. It can also be part of routine screening for certain conditions or after exposure to substances that may trigger autoimmune reactions.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The test involves a small needle, and you may feel a brief pinch. The process takes a few minutes.

What the Test Results Mean

Results are qualitative (positive or negative) and not always tied to a specific numeric range. A positive result suggests you may have antinuclear antibodies, which can indicate autoimmune activity but aren’t definitive on its own. Follow-up testing or evaluation by a healthcare provider is needed.

Possible Causes and Conditions

Positive results are commonly seen in conditions like lupus, rheumatoid arthritis, scleroderma, or other autoimmune diseases. However, some people without these conditions may also test positive, so results should be interpreted alongside clinical findings and symptoms.