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



















