Antinuclear antibodies (ANA): normal titer, positive — what it means

In shortANA is a screening test for autoimmune diseases (lupus, Sjögren’s, systemic sclerosis). Normal — negative or a titer up to 1:160. A weakly positive result occurs in 10–15% of healthy people; what matters is a high titer, the staining pattern and symptoms.

What this marker is

Antinuclear antibodies are a group of antibodies attacking components of the body’s own cell nuclei. They are characteristic of systemic autoimmune diseases, above all systemic lupus erythematosus.

The result is given as a titer (1:80, 1:160, 1:320 and higher) and a staining pattern (homogeneous, speckled, nucleolar). The higher the titer, the more meaningful the finding. Note: low titers occur in healthy people, especially women and with age — ANA is never judged without complaints and an exam.

Reference ranges

Group	Reference range
Normal	negative or titer ≤ 1:160
Weakly positive	1:160 — occurs in healthy people; watch symptoms
Significantly positive	≥ 1:320 — rheumatology workup
Staining pattern	suggests which antibodies to test next (anti-dsDNA, ENA panel)

A positive ANA is not a diagnosis: it is found in 10–15% of healthy people, during infections and with some medicines. A negative ANA makes lupus unlikely but does not exclude other autoimmune conditions. Ranges differ between laboratories.

Check your value

Enter the number from your lab report — see how it compares with the typical range. Mind the units shown in the chosen row.

An approximate comparison with a typical range, not a diagnosis. Ranges differ between laboratories — use the one on your report; a doctor interprets the result.

When it is high or appears: possible causes

Systemic lupus erythematosusHigh titers, homogeneous or speckled pattern — with anti-dsDNA and symptoms.

Sjögren’s syndromeDry eyes and mouth plus a positive ANA — Ro/SSA and La/SSB antibodies are checked.

Systemic sclerosisNucleolar or centromere staining pattern.

Autoimmune thyroiditis and hepatitisANA may accompany organ-specific autoimmune diseases.

Non-autoimmune causesInfections, some medicines, age — low titers in healthy people.

What can skew the result

These factors can shift the result without any disease — keep them in mind before a retest:

Age (titers rise in the elderly)Recent infectionsMedicines (hydralazine, isoniazid, others)Pregnancy

How to prepare

Venous blood; no special preparation. Details: Preparation: venous blood.

When a retest makes sense

With a weakly positive result and no symptoms — a check in 6–12 months at the doctor’s decision. The titer itself is not tracked as “disease activity”.

Who usually reviews this result

An out-of-range result is usually reviewed by: Rheumatologist, primary care physician. Bring your report and any previous results to the visit.

Names used on lab reports

Look for one of these names on your report:
Antinuclear antibodiesANAANAAntinuclear factor

Several markers on your report?

The app reads your whole report — this marker together with its neighbors, not one by one.

Get your results explained See an example

Frequently asked questions

ANA 1:160 — is it dangerous?

It is a borderline titer found in 10–15% of healthy people. Without symptoms (joint pain, rash, dry eyes, prolonged fever) it usually only needs observation; with symptoms — a rheumatology consult.

What is tested next after a positive ANA?

By pattern and complaints: anti-dsDNA and anti-Sm (lupus), Ro/SSA and La/SSB (Sjögren’s), Scl-70 and centromere antibodies (scleroderma), plus CBC, CRP, complement.

Can ANA turn negative?

Yes: low titers from infections and medicines can disappear. In true autoimmune disease ANA usually persists, but its titer is weakly tied to disease activity.

Sources

MedlinePlus — Antinuclear antibody panel — MedlinePlus (medlineplus.gov). Accessed: September 17, 2026.
MSD Manuals — Urinalysis — MSD Manuals (msdmanuals.com). Accessed: September 17, 2026.

Antinuclear antibodies (ANA)