Evidence-Based Supplement & Herb Guides

CH50 Test for Vasculitis: Complement Activity, Low Levels, and Immune Meaning

Learn what a low, normal, or high CH50 test means in vasculitis, how CH50 differs from C3, C4, and AH50, and why immune consumption, deficiency, treatment, and sample handling matter.

The CH50 test measures whether the classical complement pathway can complete a full immune reaction from its early proteins through the membrane attack complex....

Complement C3 and C4 Test for Vasculitis: Low Levels, Immune Complex Disease, and Meaning

Understand complement C3 and C4 results in vasculitis, including low C4, low C3 and C4, immune-complex disease, normal levels, and next tests.

Complement C3 and C4 tests measure two abundant proteins in the complement system, an immune network that helps antibodies clear microbes and damaged cells....

Cryofibrinogen Test: Blood Vessel Inflammation, Clotting, and Cold-Related Symptoms

Learn what a cryofibrinogen test detects, why warm plasma handling matters, and how positive results relate to cold-triggered clotting and vasculitis.

A cryofibrinogen test looks for a cold-precipitable protein complex in plasma. The complex usually contains fibrinogen, fibrin, fibronectin, and smaller amounts of other proteins....

Cryoglobulin Test: Vasculitis, Cold-Sensitive Antibodies, Hepatitis C, and Meaning

Understand cryoglobulin test results, warm collection, types I–III, low C4, hepatitis C links, vasculitis symptoms, and key follow-up tests.

A cryoglobulin test checks serum for immunoglobulins that precipitate when cooled and dissolve again when warmed. These proteins may be present without symptoms, but...

Eosinophil Count Test: EGPA, Allergy, Parasites, and High Eosinophils

Understand eosinophil count ranges, common causes of high eosinophils, parasite and allergy clues, EGPA warning signs, and the follow-up tests that may be needed.

An eosinophil count measures a type of white blood cell involved in allergic inflammation, defense against certain parasites, and several immune disorders. The result...

Eosinophilic Granulomatosis With Polyangiitis Blood Test Panel: ANCA, Eosinophils, IgE, and Diagnosis

Learn how an EGPA blood test panel uses ANCA, MPO antibodies, eosinophils, IgE, CRP, ESR, urine tests, and organ screening to support diagnosis.

A blood test panel for eosinophilic granulomatosis with polyangiitis (EGPA) helps identify a pattern of eosinophilic inflammation, vasculitis, and organ injury. The core tests...

GBM Antibody Panel: Lung-Kidney Syndrome, Vasculitis, and Diagnosis

Understand the GBM antibody panel for lung-kidney syndrome, including anti-GBM results, ANCA overlap, kidney and lung tests, biopsy findings, and urgent next steps.

A glomerular basement membrane (GBM) antibody panel is used when clinicians suspect anti-GBM disease, a medical emergency that can cause rapidly progressive kidney inflammation,...

Granulomatosis With Polyangiitis Blood Test Panel: PR3-ANCA, CRP, ESR, and Disease Activity

Learn how PR3-ANCA, MPO-ANCA, CRP, ESR, kidney tests, urinalysis, imaging, and biopsy work together in GPA diagnosis and disease-activity monitoring.

A granulomatosis with polyangiitis (GPA) blood test panel helps detect the antibody pattern, systemic inflammation, and organ injury associated with this form of small-vessel...

HLA-B51 Test: Behçet Disease Risk, Positive Result, and Meaning

Understand what a positive or negative HLA-B51 test means, how it affects Behçet disease risk, and why symptoms—not genetics alone—determine diagnosis.

The HLA-B51 test looks for a genetic marker associated with Behçet disease, a relapsing inflammatory disorder that can cause recurrent mouth and genital ulcers,...

IgA Blood Test for IgA Vasculitis: High Levels, Kidney Risk, and Meaning

Learn what high or normal serum IgA means in IgA vasculitis and why urine protein, blood pressure, creatinine, and eGFR determine kidney risk.

An IgA blood test measures immunoglobulin A circulating in serum. In IgA vasculitis, the result may be elevated, but it is neither sensitive nor...

IgG4 Blood Test: IgG4-Related Disease, Inflammation, and Organ Involvement

Understand high, normal, and borderline IgG4 blood results, how IgG4-related disease affects organs, and why imaging and biopsy often determine diagnosis.

An IgG4 blood test measures one subclass of immunoglobulin G. It is most often ordered when a clinician suspects IgG4-related disease, a systemic fibroinflammatory...

Large Vessel Vasculitis Blood Test Panel: CRP, ESR, IL-6, and Disease Activity

Understand how CRP, ESR, IL-6, blood counts, and imaging are used to diagnose and monitor giant cell arteritis and Takayasu arteritis.

A large vessel vasculitis blood test panel usually centers on CRP and ESR, supported by a complete blood count, kidney and liver tests, and...

Microscopic Polyangiitis Blood Test Panel: MPO-ANCA, CRP, ESR, and Kidney Risk

Learn how MPO-ANCA, CRP, ESR, urine testing, creatinine, and kidney biopsy are combined to diagnose microscopic polyangiitis and assess kidney risk.

A microscopic polyangiitis blood test panel is designed to recognize a pattern of small-vessel inflammation and, above all, identify kidney or lung injury before...

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...