Immune & Inflammation

ANA — When Your Body Fights Itself

Antinuclear antibodies are directed against structures in the cell nucleus. The test is used as a first step when findings already suggest a connective tissue disease such as lupus (SLE), Sjögren's syndrome, scleroderma or mixed connective tissue disease. A positive result is reported with a titre and a pattern, and both are needed to judge what it means. Around one in ten healthy people has a positive ANA at a low titre.

Why Test ANA Test?

This test is recommended if you've got persistent fatigue, joint pain or swelling, skin rashes (especially the telltale butterfly rash on the face), unexplained long-lasting fever, or dry eyes and mouth. It helps determine whether a deeper autoimmune investigation makes sense.

What Do High ANA Test Levels Mean?

A positive ANA means antinuclear antibodies are present. But here's an important nuance: many healthy people can have a positive ANA, especially at low levels. It can also appear temporarily during infections or with age. If positive, your doctor may check the titre strength, order more specific antibody tests and connect the dots with your full symptom picture.

What Do Low ANA Test Levels Mean?

A negative ANA means no antinuclear antibodies were detected. That makes autoimmune disease less likely — but doesn't fully rule it out, especially if symptoms persist. Context is everything.

Symptoms to Watch For

  • Fatigue that just won't budge
  • Joint pain or swelling
  • Butterfly-shaped rash on the face
  • Unexplained fever that lasts
  • Dry eyes or mouth

Who Should Get Tested?

  • People with joint swelling, a characteristic rash or other findings that suggest an autoimmune condition
  • People already under investigation for lupus or a related disease
  • People being monitored for a known autoimmune condition
  • Not recommended for fatigue alone, or without symptoms: a positive result is common in healthy people and can lead to unnecessary worry

How to Prepare for Your Test

No special prep needed. Just bring valid ID on test day.

Frequently Asked Questions

Can a healthy person have a positive ANA?
Absolutely. Up to 15% of healthy people test positive for ANA, especially at low titres. A positive ANA on its own doesn't diagnose anything — it's a screening tool that guides further investigation when something doesn't add up.
What happens after a positive ANA test?
Your doctor will likely dig deeper — checking titre strength and ordering more specific antibody tests (like anti-dsDNA, anti-Smith or anti-SSA/SSB) to narrow things down. Your full clinical picture guides the final diagnosis.
NW

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Wellth

Our content is written and reviewed by Wellth, and fact-checked against peer-reviewed research and current Swedish clinical guidelines.

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Medical Disclaimer

The information on this page is provided for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment. Wellth provides health information and testing services but is not a substitute for clinical care. Always consult a qualified healthcare provider if you have questions about a medical condition. If you are experiencing severe or urgent symptoms, contact your doctor or call 1177 Vårdguiden. Blood test results should be interpreted by a qualified healthcare professional in the context of your complete medical history.