Anti-Scl-70 Antibody Test: Systemic Sclerosis, Lung Fibrosis Risk, and Meaning
The anti-Scl-70 antibody test looks for an autoantibody strongly associated with systemic sclerosis, especially the diffuse cutaneous form and interstitial lung disease. Anti-Scl-70 is...
Anti-Smith Antibody (Anti-Sm) Test: Lupus Marker, Positive Result, and Meaning
The anti-Smith antibody test is a highly specific blood marker for systemic lupus erythematosus, commonly called lupus. It detects antibodies against Smith nuclear proteins,...
Anti-SRP Antibody Test: Necrotizing Myopathy Marker and Meaning
The anti-SRP antibody test helps identify a severe autoimmune muscle disease called anti-SRP immune-mediated necrotizing myopathy. SRP stands for signal recognition particle, a cell...
Anti-SSA/Ro Antibody Test: Sjögren Syndrome, Lupus, Pregnancy Risk, and Meaning
The anti-SSA/Ro antibody test looks for autoantibodies linked most strongly to Sjögren disease and systemic lupus erythematosus. These antibodies may also appear in subacute...
Anti-SSB/La Antibody Test: Sjögren Syndrome, Lupus, Positive Result, and Meaning
The anti-SSB/La antibody test detects autoantibodies against the La protein, an RNA-binding protein found inside cells. Anti-SSB is most often seen together with anti-SSA/Ro...
Anti-Th/To Antibody Test: Systemic Sclerosis Marker and Meaning
An anti-Th/To antibody result can be useful when systemic sclerosis is suspected but the better-known antibodies—anticentromere, anti-Scl-70, and anti-RNA polymerase III—are absent. Anti-Th/To antibodies...
Anti-TIF1-Gamma Antibody Test: Dermatomyositis, Cancer Risk, and Meaning
A positive anti-TIF1-gamma antibody result can carry two different messages at once. First, it may support a diagnosis within the dermatomyositis spectrum, especially when...
Anti-U1 RNP Antibody Test: MCTD, Lupus, Overlap Disease, and Meaning
Anti-U1 RNP antibodies are central to the diagnosis of mixed connective tissue disease, but they are not exclusive to it. The same antibody can...
CH50 Test for Lupus: Complement Activity, Low Levels, and Immune Meaning
The CH50 test asks a functional question: can the proteins in the classical complement pathway work together to complete a full immune reaction? In...
Complement C3 Test for Lupus: Low Levels, Disease Activity, Flares, and Kidney Risk
Complement C3 is one of the laboratory markers clinicians follow in systemic lupus erythematosus because it sits at the center of the complement system....
Complement C4 Test for Lupus: Low Levels, Disease Activity, Flares, and Meaning
Complement C4 is often checked in lupus because it participates near the beginning of the classical complement pathway—the route commonly activated by antibody-antigen immune...
Connective Tissue Disease Blood Test Panel: ANA, ENA, Complement, and Autoimmune Diagnosis
A connective tissue disease blood test panel is not one universal test with a single positive-or-negative answer. It is a group of laboratory studies...
CREST Syndrome Antibody Panel: Centromere, Scl-70, RNA Polymerase III, and Diagnosis
A CREST syndrome antibody panel is used to investigate systemic sclerosis, especially when Raynaud phenomenon, puffy or tight fingers, fingertip sores, reflux, telangiectasias, calcinosis,...
Early Sjogren Syndrome Antibody Panel: Salivary Gland Antibodies and Early Diagnosis
An early Sjögren syndrome antibody panel usually refers to blood tests for antibodies against salivary gland protein 1 (SP1), carbonic anhydrase 6 (CA6), and...
Lupus Blood Test Panel: ANA, Anti-dsDNA, Anti-Sm, Complement, and Disease Activity
A lupus blood test panel brings together several kinds of evidence: antibodies that support systemic lupus erythematosus, complement proteins that may change with immune-complex...
Mixed Connective Tissue Disease Panel: ANA, RNP, ENA, Symptoms, and Diagnosis
Mixed connective tissue disease (MCTD) is not diagnosed by a single blood test. It is an overlap autoimmune condition in which features associated with...
Myositis Antibody Panel: Muscle Inflammation, Interstitial Lung Disease Risk, and Diagnosis
A myositis antibody panel looks for autoantibodies associated with inflammatory muscle diseases and related syndromes. The panel can help distinguish dermatomyositis, antisynthetase syndrome, immune-mediated...
Scleroderma Antibody Panel: Scl-70, Centromere, RNA Polymerase III, and Risk Patterns
A scleroderma antibody panel helps determine whether a person’s symptoms fit systemic sclerosis and which complications deserve early attention. The three best-established antibodies are...
Sjogren Syndrome Antibody Panel: SSA/Ro, SSB/La, ANA, RF, and Diagnosis
A Sjögren syndrome antibody panel looks for immune markers that can support the diagnosis of Sjögren disease, a systemic autoimmune condition best known for...
Undifferentiated Connective Tissue Disease Blood Test Panel: ANA, ENA, Complement, and Monitoring
Undifferentiated connective tissue disease (UCTD) describes a real autoimmune pattern that has not yet developed enough defining features to be called lupus, systemic sclerosis,...