ANA optimal range and reference range
Compiled by Alina Radu, founder of Sera, from the published sources below · Last reviewed November 9, 2026
Sera's bands for ANA:
- Optimal 0 – 1:40 titer; sufficient 1:40 – 1:80 titer; out of range below 0 or above 1:80 titer.
Evidence grade: Established clinical threshold. A band edge that corresponds to a recognised diagnostic, risk or treatment threshold from a major clinical guideline or public-health body.
All units
| Unit | Optimal | Sufficient | Out of range |
|---|---|---|---|
| titer | 0 – 1:40 | 1:40 – 1:80 | below 0 or above 1:80 |
What the evidence says
A screen, and its value is mostly in ruling out: a negative ANA makes lupus unlikely, while a positive one is common in people with no disease at all — roughly a quarter of healthy adults reach 1:80, more with age and more in women. The optimal band stops below 1:80, the titre the EULAR/ACR lupus criteria use as their entry point and the level below which ARUP and Labcorp report a negative. A result of 1:80 is borderline; above that, laboratories report a positive. Titre is the signal, so 1:320 and above carries weight that 1:80 does not, and the staining pattern tells you which follow-up antibody to order. Never read a positive ANA as a diagnosis on its own.
Assay: Results differ meaningfully between platforms and methods. Compare against the interval printed by the issuing laboratory before acting on a borderline value.
Sources
- Performance of Antinuclear Antibodies for Classifying Systemic Lupus Erythematosus: A Systematic Literature Review and Meta-Regression of Diagnostic Data — Leuchten N, Hoyer A, Brinks R, et al. — Arthritis Care & Research, 2018 · Peer-reviewed publicationThe systematic review done for the EULAR/ACR criteria committee, covering 13,080 lupus patients. It concludes that an ANA of 1:80 is sensitive enough to be the entry criterion, which is why Sera's optimal band stops below 1:80. Specificity is modest at that titre and rises with each dilution.
- Antinuclear Antibody (ANA) with HEp-2 Substrate, IgG by IFA with Reflex by Pattern — ARUP Laboratories, 2026 · Laboratory / reference-interval sourceARUP's reference interval for ANA by HEp-2 immunofluorescence is less than 1:80, so a 1:40 result is reported as within the interval. Matches Sera's optimal band.
- ANA by IFA, Reflex to Titer and Pattern — Labcorp, 2026 · Laboratory / reference-interval sourceLabcorp reports below 1:80 as negative, 1:80 as borderline and above 1:80 as positive, and says titres of 1:160 or more usually go with active lupus. This supports an acceptable band of 1:80 only, not one that runs to 1:160.
- EULAR/ACR Classification Criteria for Systemic Lupus Erythematosus — European League Against Rheumatism / American College of Rheumatology, 2019 · Professional societySets an ANA of 1:80 or above on HEp-2 cells as the entry criterion for classifying lupus — nothing further is scored below it. Sera's optimal band stops immediately below that dilution. The criteria classify rather than diagnose, and a positive ANA is common in people without disease.
- Simplified Criteria for the Diagnosis of Autoimmune Hepatitis — International Autoimmune Hepatitis Group, 2008 · Professional societyScores ANA or ASMA at 1:40 as one point and at 1:80 or above as two, which is the split Sera's optimal and acceptable bands follow for ASMA. The criteria are a composite — antibodies, IgG, histology and viral exclusion together — so no antibody titre stands alone.
What Antinuclear Antibody (ANA) — Screen measures
The first-line screen for systemic autoimmunity, reported as the highest dilution at which staining is still visible on HEp-2 cells.
A screen, not a diagnosis: ANA is positive at 1:80 in a substantial minority of healthy people, and more often in women and with age, so a low titre without symptoms usually means nothing. Titre carries the signal — 1:320 and above is far more likely to matter than 1:80 — and the staining pattern points at which follow-up antibody to order. Sera stores the dilution denominator, so a report reading 1:160 is entered as 160.