Platform
Company
Immunology & Autoimmune
Review status
Currently under review
Pending specialist review and validation.
The Anti-SSB (La) test looks for autoantibodies that target the La/SS-B protein, a normal component inside cells. These antibodies can appear when the immune system becomes misdirected and reacts against the body’s own tissues. The test is performed on a blood sample using immunoassay methods.
Anti-SSB is commonly checked together with other autoantibodies, such as Anti-SSA (Ro) and antinuclear antibodies, when your clinician is evaluating possible autoimmune conditions. Results are interpreted in the context of your symptoms, examination, and other laboratory or imaging findings.
Anti-SSB can support the evaluation of suspected autoimmune connective tissue diseases, particularly Sjögren’s syndrome and, less often, systemic lupus erythematosus. Your clinician may order it if you have persistent dry eyes or dry mouth, parotid swelling, rashes, joint pain, fatigue, or other features that suggest an autoimmune process.
On its own, Anti-SSB is not diagnostic. Its presence or absence helps refine the overall picture when combined with history, exam, other antibody tests, and sometimes a salivary gland biopsy. Identifying the pattern can guide monitoring, additional testing, and treatment decisions that aim to control inflammation and protect organ function.
A positive result can occur in people with autoimmune diseases, especially when Anti-SSA is also present, but it can also appear in other contexts. A negative result does not exclude disease if your symptoms and other tests strongly suggest an autoimmune condition. Your clinician will interpret the result alongside your clinical story and other laboratory markers.
If your result is borderline or unexpected, your clinician may repeat testing, confirm with a different method, or add related tests. Over time, antibody levels can change, and treatment or intercurrent illness may influence results. Use this test as one piece of the puzzle rather than a stand‑alone answer.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
Different laboratories and methods (ELISA, line immunoassay, chemiluminescence) can yield slightly different results. If possible, use the same lab for follow‑up testing to aid comparison.
Large amounts of biotin in hair, nail, or energy supplements can interfere with some immunoassays. Tell your clinician about supplements; you may be asked to pause them before blood collection.
Recent intravenous immunoglobulin (IVIG) or plasma products can introduce antibodies that transiently affect autoantibody tests. Share any recent infusions with your care team.
Medications such as corticosteroids, rituximab, or other biologics can lower detectable autoantibody levels. Timing of testing relative to therapy can influence interpretation.
Chronic infections, liver disease, or other autoimmune disorders can be associated with autoantibodies and may complicate interpretation. A full clinical review helps avoid misclassification.
Anti-SSB often accompanies Anti-SSA. If you are pregnant or planning pregnancy and have relevant antibodies, your clinician may consider closer monitoring and coordination with obstetric care.
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