What Is an ANA Blood Test?

Q: What Is an ANA Blood Test?

ANA (Antinuclear Antibody) test explained: what it screens for (lupus, autoimmune disease), what a positive result means, and why many healthy people test positive.

ANA stands for Antinuclear Antibody. It screens for autoimmune conditions by detecting antibodies that attack your own cell nuclei.

Normal Result

Negative (below 1:40 titer)

What a Positive ANA Means

Suggests autoimmune disease but is NOT diagnostic alone
Associated conditions: lupus (95%+ positive), scleroderma, Sjögren's, rheumatoid arthritis
Many healthy people (especially women, elderly) test positive at low titers

Follow-Up for Positive ANA

ENA panel (extractable nuclear antigens)
Anti-dsDNA (specific for lupus)
Clinical correlation with symptoms

Source: NLM MedlinePlus, American Association for Clinical Chemistry.

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