Anti-dsDNA Antibody
Anti-double-stranded DNA antibodies bind to the DNA helix itself. Unlike the screening ANA, anti-dsDNA is highly specific for SLE — a positive anti-dsDNA in a patient with compatible clinical features essentially confirms the diagnosis. Levels also track disease activity, especially lupus nephritis, and a rising anti-dsDNA often precedes a flare by weeks to months.
Expected Result
Normal
Negative
Reported qualitatively or as IU/mL. Method-dependent cutoffs (typically <10 IU/mL or <30 IU/mL negative).
This is a qualitative test — results are reported as positive or negative rather than as a numeric range. Interpretation may vary by laboratory method; always review with your doctor.
What a Negative Result Means
A negative anti-dsDNA makes SLE less likely but does not exclude it — only 60–70% of SLE patients have positive anti-dsDNA. The diagnosis rests on clinical criteria plus serology as a whole, including ANA, complement, anti-Sm, and anti-phospholipid antibodies.
What a Positive Result Means
A positive anti-dsDNA strongly supports SLE — it is one of the most specific autoantibodies in medicine, present in only 1–3% of healthy people and rare in other diseases. Rising levels predict lupus flares, especially kidney involvement (lupus nephritis). Serial measurements, together with complement C3 and C4, guide treatment intensity in known SLE patients.
Frequently Asked Questions
Do anti-dsDNA levels predict a lupus flare?
Often. Rising anti-dsDNA titres with falling complement (C3, C4) precede a clinical flare by weeks to months in many patients — especially flares involving the kidneys. Serial monitoring every 3 months is standard in active or unstable lupus and every 6 months in stable disease.
Can anti-dsDNA be positive without lupus?
Rarely. Brief low-level positivity can follow some viral infections or appear with certain drugs (hydralazine, procainamide, minocycline — drug-induced lupus). A persistently positive anti-dsDNA almost always reflects SLE. Autoimmune hepatitis can also produce anti-dsDNA in a subset of patients.
Is anti-dsDNA alone enough to diagnose SLE?
No. SLE is a clinical diagnosis based on the ACR/EULAR criteria, which combine symptoms, physical findings, and laboratory tests including ANA, anti-dsDNA, anti-Sm, complement, and antiphospholipid antibodies. A positive anti-dsDNA is a strong piece of evidence but is interpreted in the context of the whole picture.
Related Autoimmune tests
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Antibody against thyroid peroxidase — key marker of autoimmune thyroiditis.
IU/mLAutoimmuneANA (Antinuclear Antibody)
Screening test for autoimmune connective tissue disease, especially lupus.
AutoimmuneRheumatoid Factor (RF)
Antibody used in rheumatoid arthritis workup — sensitive but not specific.
AutoimmuneAnti-CCP Antibody
Highly specific rheumatoid arthritis antibody — often positive before symptoms.
This information is for educational purposes only and should not replace professional medical advice. Always consult your doctor for interpretation of your test results.
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