Evidence-Based Supplement & Herb Guides

ANCA by IFA Test: c-ANCA, p-ANCA, Atypical ANCA, and Pattern Meaning

Learn how ANCA by IFA identifies c-ANCA, p-ANCA, and atypical patterns, what PR3 and MPO confirmation means, and when results need urgent follow-up.

An ANCA by IFA test looks for antibodies that bind to proteins inside neutrophils, a type of white blood cell. The laboratory reports the...

ANCA Reflex Panel: IFA Pattern, MPO Antibodies, PR3 Antibodies, and Diagnosis

Understand how an ANCA reflex panel combines IFA patterns with MPO and PR3 antibodies, how result combinations relate to vasculitis, and what follow-up tests matter.

An ANCA reflex panel is a staged blood-testing process used when clinicians suspect antineutrophil cytoplasmic antibody–associated vasculitis. Depending on the laboratory, testing may begin...

ANCA Test: Positive, Negative, Pattern, Vasculitis Risk, and Meaning

Learn what positive, negative, c-ANCA, p-ANCA, PR3, and MPO results mean, how they change vasculitis risk, and which symptoms require urgent follow-up.

An ANCA test helps evaluate whether symptoms could come from a group of small-vessel inflammatory diseases called ANCA-associated vasculitis. A positive result can raise...

Angiotensin-Converting Enzyme (ACE) Test: Sarcoidosis, Granulomatous Disease, and Meaning

Learn what a high, normal, or low ACE test means, why ACE cannot diagnose sarcoidosis alone, and how medications, imaging, biopsy, and organ testing guide follow-up.

The angiotensin-converting enzyme (ACE) blood test measures the activity of ACE in serum. Clinicians sometimes use it as a supporting marker when sarcoidosis is...

Anti-Glomerular Basement Membrane (Anti-GBM) Test: Goodpasture Syndrome and Kidney-Lung Disease

Understand what positive, negative, and borderline anti-GBM test results mean, how Goodpasture syndrome affects the kidneys and lungs, and why biopsy, ANCA testing, and urgent treatment matter.

The anti-glomerular basement membrane test looks for antibodies that can rapidly injure the kidney’s filtering capillaries and, in some people, the air sacs of...

Behcet Disease Blood Test Panel: HLA-B51, CRP, ESR, and Inflammation Markers

Learn how HLA-B51, CRP, ESR, blood counts, and organ-specific tests are used in Behçet disease, why no blood panel confirms the diagnosis, and which symptoms need urgent care.

A Behçet disease blood test panel can support an evaluation, but it cannot confirm or rule out Behçet disease by itself. The diagnosis rests...

c-ANCA Test: Granulomatosis With Polyangiitis, PR3 Antibodies, and Meaning

Learn what a positive or negative c-ANCA test means, how PR3 antibodies support granulomatosis with polyangiitis, why results can mismatch, and when biopsy or urgent care is needed.

A c-ANCA result describes a cytoplasmic staining pattern seen when a patient’s antibodies bind to neutrophils in an indirect immunofluorescence test. In granulomatosis with...

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...