Understanding Your Diagnostic Test: What It Is, How It Is Done, and How to Get Ready

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

A blood test that detects antibodies targeting cell nuclei, used to help diagnose autoimmune disorders.

Quick summary

{"Measures anti-nuclear antibodies (ANA) in your blood","Helps diagnose autoimmune diseases like lupus and rheumatoid arthritis","A positive result requires further testing for confirmation","Test is done through a simple blood draw","Results should be interpreted by your healthcare provider"}

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

Key facts at a glance

LOINC: 108020-9
Short code: ANA Msmt Ser
Synonyms: ANA Msmt Ser
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

The Nuclear Antibody (ANA) test is a blood test that detects anti-nuclear antibodies—proteins produced by your immune system that mistakenly attack the nuclei of your own cells. Normally, your immune system protects you from foreign invaders like viruses and bacteria. In autoimmune conditions, the immune system mistakenly produces antibodies against your own body's tissues.

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

A healthcare professional will draw a small blood sample from a vein in your arm. The sample is then sent to a laboratory for analysis. The lab will look for the presence and concentration (titer) of ANA in your blood serum. Results are typically reported as a titer (like 1:40, 1:160, etc.) and may include a staining pattern.

Do I need to prepare for this test, such as fasting or adjusting my medications beforehand?

Generally, no special preparation is needed. You do not need to fast before this test. However, always follow any specific instructions your healthcare provider gives you. Certain medications can affect test results, so inform your doctor about all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

A positive ANA test suggests the presence of an autoimmune disease, but it does not confirm a specific diagnosis. The test is primarily used as a screening tool. Conditions associated with a positive ANA include Systemic Lupus Erythematosus (SLE), which is the most common, as well as Rheumatoid Arthritis, Sjögren's Syndrome, Scleroderma, Polymyositis, Dermatomyositis, and Autoimmune Hepatitis. The titer level and staining pattern provide additional clues—higher titers and specific patterns (such as homogeneous, speckled, or nucleolar) are more strongly associated with autoimmune diseases.

Important note: A positive ANA can occur in healthy individuals, especially older adults, and does not necessarily mean you have an autoimmune disease. Conversely, some people with autoimmune diseases may have negative ANA results, particularly in early stages. Your doctor will interpret your result in context with your symptoms, physical exam, and other test results.

Frequently asked questions

What does a positive ANA result mean?

A positive ANA result indicates the presence of anti-nuclear antibodies in your blood. While this can suggest an autoimmune disease, it is not a definitive diagnosis. Many people test positive without having an autoimmune condition. Your healthcare provider will order additional tests and consider your symptoms to determine if further evaluation is needed.

Does a negative ANA rule out autoimmune disease?

Not always. Some people with autoimmune diseases may have negative ANA results, especially in the early stages of the disease or with certain types of autoimmune conditions. If you have symptoms suggestive of an autoimmune disease despite a negative ANA, your doctor may recommend further testing or repeat the test at a later time.

What is the difference between ANA titer and pattern?

The titer indicates the concentration of antibodies—higher titers (like 1:320) are more significant than lower ones (like 1:40). The pattern refers to how the antibodies appear under the microscope when stained. Different patterns (homogeneous, speckled, nucleolar, centromere) can suggest different autoimmune conditions. Both are important for interpretation.

Do I need to fast before the ANA test?

No, fasting is not typically required for the ANA test. You can eat and drink normally before the blood draw. However, always follow any specific instructions provided by your healthcare provider or testing facility.

Can medications affect my ANA test results?

Yes, certain medications can cause a false-positive ANA result. These include some blood pressure medications, antibiotics, and anti-seizure drugs. Always inform your doctor about all medications, supplements, and over-the-counter drugs you are taking before the test.

Sources

1
MedlinePlus -ANA TestSource
2
May Clinic - ANA TestSource
3
Arthritis Foundation - Understanding ANA ResultsSource

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