Anti-dsDNA Antibodies
Immunsystem & EntzündungZuletzt geprüft: 7. April 2026. Quellenansatz: Standardkontext zur Laborinterpretation, allgemeine medizinische Referenzmaterialien sowie öffentliche Gesundheits- oder klinische Leitlinien, sofern relevant.
Was ist Anti-dsDNA Antibodies?
Anti-double-stranded DNA (anti-dsDNA) antibodies are autoantibodies directed against the double-helical structure of native DNA. They are a hallmark serological marker of systemic lupus erythematosus (SLE) and are included in both the 2019 EULAR/ACR and the older 1997 ACR classification criteria for SLE. These antibodies belong predominantly to the IgG class and are thought to contribute directly to disease pathogenesis, particularly lupus nephritis, through immune complex deposition in the glomeruli.
Several laboratory methods are used to detect anti-dsDNA antibodies, each with different sensitivity and specificity profiles. The Farr assay (radioimmunoassay) and the Crithidia luciliae immunofluorescence test (CLIFT) are considered the most specific for SLE, though they are less sensitive. ELISA-based methods are more sensitive but less specific, potentially detecting antibodies against single-stranded DNA or other nuclear antigens. The choice of assay affects the clinical interpretation of results. Serial monitoring of anti-dsDNA titers is used to track SLE disease activity, as titers often rise during flares, particularly renal flares.
Warum der Wert wichtig ist
Anti-dsDNA antibodies are highly specific for SLE (95–97% specificity by CLIFT or Farr assay), making them one of the most useful diagnostic markers. They are found in 60–70% of SLE patients at some point during their disease course. Rising anti-dsDNA titers often precede clinical flares, particularly lupus nephritis, and can prompt preemptive treatment intensification. Anti-dsDNA antibodies form immune complexes that deposit in the kidneys, skin, and joints, directly contributing to tissue damage. Their presence, especially at high titers, is associated with more severe disease, including proliferative glomerulonephritis.
Normale Referenzbereiche
| Gruppe | Bereich | Einheit |
|---|---|---|
| Adults (ELISA) | <30 | IU/mL |
| Adults (CLIFT) | Negative | |
| Adults (Farr assay) | <7 | IU/mL |
Referenzbereiche können je nach Labor variieren. Vergleichen Sie Ihre Ergebnisse immer mit den Bereichen Ihres Testlabors.
Was hohe Anti-dsDNA-Werte bedeuten
Häufige Ursachen
- Systemic lupus erythematosus (most specific association)
- Lupus nephritis (correlates with renal disease activity)
- Drug-induced lupus (rarely anti-dsDNA positive; more commonly anti-histone)
- Mixed connective tissue disease (occasionally)
- Autoimmune hepatitis (occasionally)
Mögliche Symptome
- Joint pain and swelling
- Butterfly (malar) rash
- Fatigue
- Fever
- Photosensitivity
- Oral ulcers
- Foamy urine or edema (if lupus nephritis)
- Pleuritis or pericarditis
Was zu tun ist: Elevated anti-dsDNA antibodies in the context of compatible clinical features strongly support a diagnosis of SLE. Check complement levels (C3, C4)—low complement with high anti-dsDNA suggests active disease and possible lupus nephritis. Urinalysis and urine protein-to-creatinine ratio should be assessed to evaluate for renal involvement. If lupus nephritis is suspected, renal biopsy may be needed for classification and treatment planning. Treatment is guided by organ involvement and may include hydroxychloroquine, corticosteroids, mycophenolate, or belimumab.
Was niedrige Anti-dsDNA-Werte bedeuten
Häufige Ursachen
- Normal result—no autoantibodies detected
- SLE in remission
- Effective immunosuppressive therapy
Mögliche Symptome
- No symptoms associated with negative anti-dsDNA
Was zu tun ist: Negative anti-dsDNA does not exclude SLE—approximately 30–40% of SLE patients are anti-dsDNA negative, particularly those with milder disease or predominantly cutaneous or musculoskeletal involvement. If clinical suspicion remains, test other SLE-associated antibodies (anti-Smith, anti-RNP, anti-Ro/SSA, anti-La/SSB). In known SLE patients, declining anti-dsDNA levels with treatment indicate improving disease activity.
Wann wird ein Anti-dsDNA-Test empfohlen?
- Suspected systemic lupus erythematosus (especially with positive ANA)
- Monitoring SLE disease activity and predicting flares
- Evaluating suspected lupus nephritis
- Following response to immunosuppressive therapy in SLE
Häufig gestellte Fragen
Verwandte Biomarker
Quellen- und Prüfungsansatz
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