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Understanding Your Laboratory Test: What It Is, How It Is Done, and What Your Results Mean

Published: August 9, 2026Updated: August 16, 2026

The Nuclear Antibody test detects proteins in the blood that may attack the body's own cells, helping diagnose autoimmune conditions.

Quick summary

{"Checks for antibodies that mistakenly target your own cell nuclei","Helps diagnose autoimmune diseases like lupus and rheumatoid arthritis","Simple blood test with results typically available in a few days","Positive result does not always mean you have a disease","Follow-up testing is often needed to confirm diagnosis"}

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
31541-6
Short code
ANA Pcar-aCnc
Synonyms
ANA Pcar-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
86038
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test, and why might my healthcare provider recommend it for me?

The Nuclear Antibody (ANA) test is a blood test that looks for antinuclear antibodies in your bloodstream. These are proteins produced by your immune system that, instead of protecting you from harmful substances, mistakenly attack your own healthy cells' nuclei. This test is primarily used to help doctors identify autoimmune disorders where the immune system attacks the body's own tissues.

How is this test performed, and what can I expect before, during, and after the procedure?

A healthcare professional will draw a small blood sample from a vein in your arm. The procedure takes only a few minutes and is generally well-tolerated. You may experience slight discomfort or bruising at the puncture site, but serious complications are rare. You do not need to fast before this test.

What do the results of this test mean, and how will my doctor use them to guide my care?

Results are typically reported as a titer (a measure of concentration) and a pattern. A positive ANA test means that antinuclear antibodies were detected in your blood. However, a positive result does not automatically mean you have an autoimmune disease. Many healthy people, especially older adults, may have a positive ANA without any illness. Your doctor will interpret results based on your symptoms, physical examination, and additional tests.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

The ANA test is primarily used to screen for autoimmune disorders such as systemic lupus erythematosus (SLE), Sjogren's syndrome, scleroderma, polymyositis, and mixed connective tissue disease. It can also help differentiate between different types of autoimmune conditions and monitor disease activity. However, the test should always be interpreted in clinical context, as positive results can occur in infections, certain medications, liver disease, and other conditions unrelated to autoimmune disease.

Frequently asked questions

Do I need to prepare for the test?
No special preparation is needed. You can eat and drink normally before the test. However, inform your doctor about any medications you are taking, as some drugs can affect test results.
Is the test painful?
The test involves a needle stick to draw blood, which may cause brief discomfort similar to a pinprick. Most people tolerate it well with minimal pain.
What happens if my result is positive?
A positive ANA result requires further evaluation. Your doctor will likely order additional tests to determine the cause, such as specific antibody tests (anti-dsDNA, anti-Sm, etc.) and will consider your symptoms and medical history before making a diagnosis.
Can medications affect my results?
Yes, certain medications including some blood pressure drugs, antibiotics, and anti-seizure medications may cause false-positive results. Always tell your doctor about all medications and supplements you are taking.
How long does it take to get results?
Results are usually available within a few days to a week, depending on the laboratory. Your healthcare provider will contact you with the results or discuss them at a follow-up appointment.
  1. 1
    MedlinePlus -ANA TestSource
  2. 2
    May Clinic - ANA TestSource
  3. 3
    Arthritis Foundation - Understanding ANASource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy