Sm/RNP Antibody details
What Sm/RNP Antibody shows
Sm/RNP antibodies, often called anti-RNP or anti-U1 RNP, are autoantibodies that target a complex of proteins and RNA inside cell nuclei. This test is usually done when an ANA test is positive or when symptoms suggest a connective tissue disease. A positive result, especially at high levels, is strongly associated with mixed connective tissue disease, and it is also seen in lupus and sometimes in systemic sclerosis or other autoimmune conditions. A positive result does not diagnose any condition on its own and is interpreted alongside other antibodies, such as anti-Sm and anti-dsDNA, and your symptoms.
Tests that include Sm/RNP Antibody
This test detects the presence of Smith (Sm)/U1-RNP Antibody, which is often found in patients with mixed connective tissue disease. This condition shares characteristics of systemic lupus erythematosus (SLE), scleroderma, and polymyositis, making this test crucial for diagnosis.
- Sm/RNP Antibody Measures antibodies to the Sm/RNP complex, autoantibodies linked to mixed connective tissue disease and lupus, used when evaluating a positive ANA.
ANA + 11 Components is a comprehensive blood test that includes the presence of antinuclear antibodies (ANAs), which are autoantibodies targeting the cell nucleus. A positive ANA screen suggests potential autoimmune activity. 11 ANA Components tests for 11 specific autoantibodies against distinct nuclear antigens, helping to identify or differentiate particular autoimmune diseases.
- Chromatin Antibodies Autoantibodies that target chromatin (DNA-protein complexes) inside your cells. Associated with lupus and other autoimmune conditions.
- Anti-Jo-1 An autoantibody associated with certain autoimmune muscle and lung conditions, including polymyositis, dermatomyositis, and antisynthetase syndrome.
- Ribosomal P Antibody An autoantibody associated with lupus, particularly linked to neuropsychiatric symptoms in some patients.
- RNP Antibody An autoantibody associated with mixed connective tissue disease and, at times, lupus.
- Smith (Sm) Antibody An autoantibody highly specific for lupus, though present in only a portion of people with the disease.
- Centromere B Antibody Autoantibodies that target a structure inside your cells called the centromere. Strongly associated with limited scleroderma (CREST syndrome).
- Double-Stranded DNA (dsDNA) Antibody Antibodies against double-stranded DNA. Highly specific for lupus and often used to track disease activity.
- Scleroderma (Scl-70) Antibody An autoantibody strongly associated with diffuse systemic sclerosis (scleroderma), a more widespread form of the disease.
- Sjögren's Syndrome A (SS-A/Ro) Antibody An autoantibody associated with Sjögren's syndrome and lupus; also relevant in pregnancy due to a risk of neonatal heart complications.
- Sjögren's Syndrome B (SS-B/La) Antibody An autoantibody associated with Sjögren's syndrome and lupus, often found alongside SS-A antibodies.
- Sm/RNP Antibody Measures antibodies to the Sm/RNP complex, autoantibodies linked to mixed connective tissue disease and lupus, used when evaluating a positive ANA.
Not sure how to read your results? We can help.
Schedule a consultation with a Hormunity specialist. We’ll walk through every marker, interpret what it means for you, and map out the next steps for your care.
Book a specialist