Anti-dsDNA Antibodies
Imunidade e inflamaçãoÚltima revisão: 7 de abril de 2026. Abordagem de fontes: contexto padrão de interpretação laboratorial, material médico de referência e orientações clínicas ou de saúde pública quando relevantes.
O que é 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.
Por que isso importa
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.
Faixas de referência normais
| Grupo | Faixa | Unidade |
|---|---|---|
| Adults (ELISA) | <30 | IU/mL |
| Adults (CLIFT) | Negative | |
| Adults (Farr assay) | <7 | IU/mL |
As faixas de referência podem variar entre laboratórios. Sempre compare seus resultados com as faixas fornecidas pelo seu local de exame.
O que significam níveis altos de Anti-dsDNA
Causas comuns
- 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)
Possíveis sintomas
- Joint pain and swelling
- Butterfly (malar) rash
- Fatigue
- Fever
- Photosensitivity
- Oral ulcers
- Foamy urine or edema (if lupus nephritis)
- Pleuritis or pericarditis
O que fazer: 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.
O que significam níveis baixos de Anti-dsDNA
Causas comuns
- Normal result—no autoantibodies detected
- SLE in remission
- Effective immunosuppressive therapy
Possíveis sintomas
- No symptoms associated with negative anti-dsDNA
O que fazer: 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.
Quando o exame de Anti-dsDNA é recomendado?
- 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
Perguntas frequentes
Biomarcadores relacionados
Referências e abordagem de revisão
As páginas do glossário de biomarcadores são explicações educativas e devem ser interpretadas junto com as faixas de referência e observações fornecidas pelo seu laboratório e pelo seu médico. Para conhecer nossos padrões editoriais e processo de revisão, veja nossa Política editorial e a nossa revisão de conteúdo.
Quer analisar seus níveis de Anti-dsDNA?
Envie seus resultados de exames para receber uma análise instantânea com IA de todos os seus biomarcadores.
Enviar resultados de exames →Aviso médico: Estas informações são apenas educativas e não substituem orientação, diagnóstico ou tratamento médico profissional. As faixas de referência podem variar entre laboratórios. Sempre converse com seu profissional de saúde sobre a interpretação dos seus resultados específicos.