Description
The Anti-dsDNA Antibody Test is a highly specific autoimmune blood test primarily used to diagnose and monitor Systemic Lupus Erythematosus (SLE), commonly known as Lupus. It detects harmful antibodies that mistakenly attack the body’s own genetic material.
In a healthy immune system, antibodies are produced to fight off foreign invaders like bacteria and viruses. In autoimmune diseases like Lupus, the immune system gets confused and creates “autoantibodies” that attack the body’s own healthy tissues.
This specific test looks for autoantibodies that target double-stranded DNA (dsDNA)
, the genetic blueprint found inside almost all of your cells. The test is performed using a highly sensitive laboratory method called ELISA (Enzyme-Linked Immunosorbent Assay).
Clinical Significance:
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Diagnosing Lupus (SLE): Anti-dsDNA antibodies are highly specific to Lupus. While they are not present in every single person with Lupus (found in about 60-70% of cases), if they are present, it is a very strong confirmation of the disease.
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Monitoring Disease Activity: This is one of the few autoimmune tests where the quantity of the antibody matters for daily management. Anti-dsDNA levels often rise significantly right before or during a Lupus “flare-up” and drop when the disease goes into remission or responds well to immunosuppressive treatment.
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Kidney Risk Assessment: High levels of Anti-dsDNA are strongly linked to Lupus Nephritis, a serious complication where the disease attacks the kidneys. Monitoring these levels helps rheumatologists protect your kidney function.
When is this test recommended?
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After a positive ANA Test: It is usually ordered as a follow-up test if a general ANA (Anti-Nuclear Antibody) screening comes back positive, and the patient has symptoms like persistent joint pain, unexplained fatigue, or a butterfly-shaped rash across the cheeks and nose.
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Routine Monitoring: For patients already diagnosed with Lupus, to track disease activity and medication effectiveness.
Sample Requirements:
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Specimen: Serum (Blood).
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Container: Gold Top (SST) or Red Top Tube.
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Preparation: No fasting is required.
