Question 1

Is ANA specific for lupus?

Accepted Answer

No. ANA is sensitive for established systemic lupus erythematosus, but it is not specific. Many people with a positive ANA do not have lupus, especially with low titers and no compatible symptoms.

Question 2

Can I have a positive ANA test but not have an autoimmune disease?

Accepted Answer

Yes, having antinuclear antibodies in your blood doesn't always mean you have a disease. Some healthy people have antinuclear antibodies in their blood, and levels tend to increase with age. As you can see, low titer ANA antibodies are found frequently in the general population. Even high titer ANA's can be seen in healthy adults who do not have an autoimmune disease. This is why additional testing and clinical evaluation are typically needed to determine if an autoimmune condition is present.

Question 3

What autoimmune diseases can an ANA test help diagnose?

Accepted Answer

An ANA test can help diagnose systemic lupus erythematosus (SLE), the most common type of lupus. Rheumatoid arthritis, a condition that mostly affects joints, causing pain and swelling often in the wrists, hands, and feet. Scleroderma, a rare disease that may affect the skin, blood vessels, and organs. Sjögren's syndrome, a rare disease that affects the glands that make tears and saliva (spit) and other parts of the body. The test may also be associated with other autoimmune conditions including autoimmune hepatitis and thyroid diseases.

Question 4

How accurate is the ANA test for diagnosing lupus?

Accepted Answer

The 2019 EULAR/ACR Classification Criteria for SLE now require ANA positivity (≥ 1:80 on HEp-2 or equivalent) as an entry criterion, reflecting its high sensitivity (~97-98%) in SLE diagnosis: even in early disease stages. However, the ANA result must be interpreted in the specific context of an individual patient's symptoms, underlying medical conditions, and other test results. A positive ANA blood test means autoantibodies are present, but it's not a sure sign of an autoimmune disease.

Question 5

Should I repeat the ANA test if it's negative?

Accepted Answer

A negative ANA does NOT need to be repeated! If the ANA test is negative, do not order additional antibody testing. A negative result typically means that antinuclear antibodies were not detected in sufficient quantities to suggest an autoimmune condition. However, if new symptoms develop or clinical suspicion for autoimmune disease increases, healthcare providers may consider retesting in specific circumstances.

Question 6

What do the different ANA patterns mean?

Accepted Answer

The pattern of the ANA test can give information about the type of autoimmune disease present and the appropriate treatment program. A homogenous (diffuse) pattern appears as total nuclear fluorescence and is common in people with systemic lupus. A peripheral pattern indicates that fluorescence occurs at the edges of the nucleus in a shaggy appearance; this pattern is almost exclusive to systemic lupus. Other patterns include speckled and centromere patterns, each potentially associated with different autoimmune conditions.

Question 7

Can medications affect my ANA test results?

Accepted Answer

Yes, drugs (i.e., procainamide, phenytoin, penicillin, and hydralazine), neoplasms, chronic liver disease, viral illnesses, and chronic infections may result in low titers of ANAs. Also, certain medicines can cause antinuclear antibodies. If you are taking medications, discuss with your healthcare provider whether they might affect your test results, but do not stop taking prescribed medications without medical guidance.

ANA (Antinuclear Antibodies)