Evidence-Based Supplement & Herb Guides

MPO-ANCA Antibody Test: MPA, EGPA, Vasculitis, Positive Result, and Meaning

Understand positive, negative, and borderline MPO-ANCA results, their links to MPA and EGPA, and the organ tests needed to confirm active vasculitis.

The MPO-ANCA antibody test detects autoantibodies directed against myeloperoxidase, an enzyme inside neutrophils. A positive result is most strongly associated with microscopic polyangiitis and...

p-ANCA Test: Microscopic Polyangiitis, MPO Antibodies, and Meaning

Learn what a p-ANCA pattern means, how it differs from MPO-ANCA, and when results support microscopic polyangiitis versus bowel, liver, drug, or infection causes.

A p-ANCA result describes a perinuclear fluorescence pattern seen when a patient’s serum reacts with ethanol-fixed neutrophils. It does not identify one disease or...

PR3-ANCA Antibody Test: GPA Vasculitis, Positive Result, and Meaning

Understand positive, negative, and changing PR3-ANCA results, their link to GPA, and why organ testing—not the antibody number alone—determines urgency.

The PR3-ANCA antibody test detects antibodies against proteinase 3, a neutrophil enzyme. A clearly positive result is strongly associated with granulomatosis with polyangiitis, especially...

Soluble IL-2 Receptor Test: Sarcoidosis, Immune Activation, and Inflammation

Understand what high or normal soluble IL-2 receptor means in sarcoidosis and why immune activation, lymphoma, infection, kidney function, imaging, and biopsy affect interpretation.

The soluble interleukin-2 receptor test measures circulating soluble CD25, a protein released mainly by activated T lymphocytes. It can be elevated in sarcoidosis and...

Vasculitis Blood Test Panel: ANCA, MPO, PR3, CRP, ESR, Complement, and Diagnosis

Learn how ANCA, MPO, PR3, CRP, ESR, complement, urine tests, imaging, and biopsy work together in a focused vasculitis diagnostic evaluation.

A vasculitis blood test panel is not one fixed bundle that can confirm or exclude every form of blood vessel inflammation. Vasculitis includes many...

14-3-3 Eta Protein Test: Rheumatoid Arthritis, Joint Damage Risk, and Disease Activity

Understand the 14-3-3 eta protein test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

The 14-3-3 eta protein test test measures the extracellular 14-3-3η protein, a signaling protein released in inflamed joint tissue. It can add useful information...

Ankylosing Spondylitis Blood Test Panel: HLA-B27, CRP, ESR, and Diagnosis

Understand the ankylosing spondylitis blood test panel, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

HLA-B27 genetic status plus CRP and ESR inflammation markers is not diagnosed by a single blood result. The panel combines genetic and inflammatory clues...

Anti-Carbamylated Protein (Anti-CarP) Test: Rheumatoid Arthritis Marker and Prognosis

Understand the anti-carbamylated protein (anti-CarP) antibody test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

The anti-carbamylated protein (anti-CarP) antibody test test measures antibodies against proteins altered by carbamylation, a chemical modification distinct from citrullination. It can add useful...

Anti-CCP Antibody Test: Rheumatoid Arthritis Diagnosis, Positive Result, and Prognosis

Understand the anti-CCP antibody test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

The anti-CCP antibody test test measures IgG antibodies that bind laboratory cyclic citrullinated peptides and serve as a standardized ACPA assay. It can add...

Anti-Citrullinated Protein Antibody (ACPA) Test: Rheumatoid Arthritis Diagnosis and Disease Risk

Understand the anti-citrullinated protein antibody (ACPA) test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

The anti-citrullinated protein antibody (ACPA) test test measures a family of autoantibodies directed against citrullinated proteins; anti-CCP is the most common clinical assay. It...

Anti-Mutated Citrullinated Vimentin (Anti-MCV) Test: Rheumatoid Arthritis Activity and Meaning

Understand the anti-mutated citrullinated vimentin (anti-MCV) antibody test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

The anti-mutated citrullinated vimentin (anti-MCV) antibody test test measures antibodies against a modified, citrullinated form of vimentin found in inflamed tissue. It can add...

Anti-RA33 Antibody Test: Rheumatoid Arthritis Marker, Early Disease, and Meaning

Understand the anti-RA33 antibody test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

The anti-RA33 antibody test test measures autoantibodies against heterogeneous nuclear ribonucleoprotein A2/B1, historically called the RA33 antigen. It can add useful information when rheumatoid...

Anti-Sa Antibody Test: Rheumatoid Arthritis Marker, Positive Result, and Meaning

Understand the anti-Sa antibody test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

The anti-Sa antibody test test measures antibodies to citrullinated vimentin, originally identified through the Sa antigen system. It can add useful information when rheumatoid...

Cartilage Oligomeric Matrix Protein (COMP) Test: Joint Damage, Cartilage Breakdown, and Arthritis

Understand the cartilage oligomeric matrix protein (COMP) test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

The cartilage oligomeric matrix protein (COMP) test test measures fragments or circulating levels of COMP, an extracellular-matrix protein abundant in cartilage and also present...

CCP IgG Antibody Test: Rheumatoid Arthritis Risk, Early Diagnosis, and Meaning

The CCP IgG antibody test test measures IgG-class antibodies against cyclic citrullinated peptides. It can add useful information when rheumatoid arthritis (RA) is suspected,...

CRP Test for Rheumatoid Arthritis: Disease Activity, Flares, Inflammation, and Monitoring

Learn how the CRP test reflects rheumatoid arthritis inflammation, including ranges, flares, normal results, high causes, treatment monitoring, and follow-up.

The C-reactive protein (CRP) test helps estimate inflammation in rheumatoid arthritis (RA), but it does not measure joint damage directly and cannot confirm a...

ESR Test for Rheumatoid Arthritis: Inflammation, Disease Activity, Flares, and Monitoring

Learn how the ESR test reflects rheumatoid arthritis inflammation, including ranges, flares, normal results, high causes, treatment monitoring, and follow-up.

The erythrocyte sedimentation rate (ESR) test helps estimate inflammation in rheumatoid arthritis (RA), but it does not measure joint damage directly and cannot confirm...

HLA-B27 Test: Ankylosing Spondylitis, Spondyloarthritis Risk, and Meaning

Understand what a positive or negative HLA-B27 blood test means, how it relates to ankylosing spondylitis and spondyloarthritis, and what follow-up may help.

The HLA-B27 test looks for an inherited immune-system marker that is strongly associated with ankylosing spondylitis and several related forms of spondyloarthritis. A positive...

Matrix Metalloproteinase-3 (MMP-3) Test: Joint Inflammation, Synovitis, and Disease Activity

Learn what an MMP-3 blood test can show about synovitis, rheumatoid arthritis activity, joint damage risk, treatment response, and reasons for high or normal results.

The matrix metalloproteinase-3 test measures MMP-3, an enzyme released by cells in inflamed joint lining and other tissues. In rheumatoid arthritis, higher blood levels...

Rheumatoid Arthritis Blood Test Panel: RF, Anti-CCP, CRP, ESR, and Diagnosis

Understand how RF, anti-CCP, CRP, and ESR work together in a rheumatoid arthritis blood test panel, what common result patterns mean, and why examination still matters.

A rheumatoid arthritis blood test panel helps answer two different questions: whether the immune pattern supports rheumatoid arthritis and whether inflammation is active. Rheumatoid...