Anti-dsDNA
Also known as: Anti-Double Stranded DNA, dsDNA Antibodies
What Does Anti-dsDNA Measure?
Anti-dsDNA (Anti-Double Stranded DNA) is a blood test that measures the level of autoantibodies directed against double-stranded DNA, which is the genetic material found in the nucleus of every cell in your body. In a healthy immune system, the body does not produce antibodies against its own DNA. When these antibodies are present, it indicates that the immune system has mistakenly begun attacking the body's own genetic material, a hallmark of autoimmune dysfunction. The test detects and quantifies these abnormal antibodies in the bloodstream, typically reported as a titer (concentration ratio) or in International Units per milliliter (IU/mL).
Why Does Anti-dsDNA Matter?
Anti-dsDNA antibodies are one of the most clinically significant markers in diagnosing and monitoring Systemic Lupus Erythematosus (SLE), commonly known as lupus. They are highly specific for SLE, meaning their presence strongly suggests this diagnosis over other autoimmune conditions. Elevated levels correlate closely with disease activity, particularly lupus nephritis (kidney involvement), which is one of the most serious complications of the disease. Because anti-dsDNA levels tend to rise before lupus flares and fall during remission, this test is invaluable not just for diagnosis but for ongoing disease monitoring, guiding treatment decisions, and predicting organ damage. It is one of the 11 classification criteria used by the American College of Rheumatology for diagnosing SLE.
Normal Ranges
Males
Negative: <10 IU/mL; Borderline: 10-15 IU/mL; Positive: >15 IU/mL
Females
Negative: <10 IU/mL; Borderline: 10-15 IU/mL; Positive: >15 IU/mL
Children
Negative: <10 IU/mL; reference ranges vary slightly by laboratory and testing method
Causes of High Levels
- Systemic Lupus Erythematosus (SLE) – the most common and specific cause; levels often correlate directly with disease activity
- Lupus nephritis – kidney inflammation due to lupus frequently causes markedly elevated anti-dsDNA levels
- Drug-induced lupus – certain medications such as hydralazine, procainamide, isoniazid, and minocycline can trigger anti-dsDNA antibody production
- Other autoimmune conditions – including Sjögren's syndrome, mixed connective tissue disease, and rheumatoid arthritis can occasionally produce low-positive results
- Chronic infections – hepatitis C, HIV, and certain bacterial infections may produce low-level false-positive results
- Primary biliary cholangitis – this liver autoimmune condition is occasionally associated with low-titer anti-dsDNA positivity
Causes of Low Levels
- Successful immunosuppressive treatment – effective therapy with corticosteroids, hydroxychloroquine, or other immunosuppressants typically lowers anti-dsDNA levels
How to Improve Your Anti-dsDNA
Diet
- Follow an anti-inflammatory diet rich in omega-3 fatty acids from fatty fish (salmon, mackerel, sardines) at least 2-3 times per week to help modulate immune responses
- Increase consumption of antioxidant-rich fruits and vegetables such as berries, leafy greens, and cruciferous vegetables to reduce oxidative stress that can trigger flares
- Minimize processed foods, refined sugars, and saturated fats, which promote systemic inflammation and may worsen autoimmune activity
- Consider reducing alfalfa sprouts and high-dose L-canavanine supplements, which have been associated with triggering lupus flares in some individuals
- Maintain adequate vitamin D intake through diet (fortified foods, fatty fish) as vitamin D deficiency is common in lupus patients and linked to higher disease activity
Supplements
- Vitamin D3: 1,000–4,000 IU/day (under physician supervision with monitoring) – deficiency is highly prevalent in SLE and may worsen immune dysregulation
- Omega-3 fatty acids (fish oil): 2–4 g/day of combined EPA and DHA – shown in studies to modestly reduce lupus disease activity and inflammation
- Hydroxychloroquine (Plaquenil) – while a prescription medication rather than a supplement, it is a cornerstone treatment that reduces anti-dsDNA levels and flare frequency
Related Biomarkers
Frequently Asked Questions
Does a positive anti-dsDNA test always mean I have lupus?
Not necessarily, but it is a strong indicator. Anti-dsDNA antibodies are highly specific for Systemic Lupus Erythematosus (SLE) – meaning a positive result rarely occurs in people without lupus. However, diagnosis requires meeting additional clinical and laboratory criteria established by the American College of Rheumatology. Low-positive or borderline results can occasionally occur with other autoimmune conditions, chronic infections, or certain medications. Your rheumatologist will interpret the result alongside your symptoms, physical examination, and other lab tests such as ANA, complement levels, and urinalysis before making a diagnosis.
How is anti-dsDNA different from the ANA test?
The ANA (Antinuclear Antibody) test is a broad screening test that detects any antibodies targeting the cell nucleus. It is very sensitive but not very specific, meaning many people with a positive ANA do not have lupus. Anti-dsDNA is a more specific follow-up test that detects antibodies targeting only double-stranded DNA. A positive anti-dsDNA result is far more specific for lupus than a positive ANA. Typically, an ANA is done first, and if positive, anti-dsDNA and other specific autoantibody tests are ordered to narrow down the diagnosis.
How often should anti-dsDNA levels be monitored in lupus patients?
For patients with established lupus, anti-dsDNA levels are typically monitored every 3 to 6 months during routine follow-up, or more frequently during periods of active disease or when treatment is being adjusted. Since rising anti-dsDNA levels often precede clinical flares – sometimes by weeks to months – regular monitoring allows physicians to proactively intensify treatment and potentially prevent organ damage, particularly lupus nephritis. Your rheumatologist will determine the optimal monitoring frequency based on your individual disease course and stability.