Cytoplasmic ANCA (Anti-Proteinase 3) (c-ANCA / PR3)
Autoantibodies targeting proteinase-3 (PR3) in neutrophil azurophilic granules, producing diffuse cytoplasmic fluorescence.
Standard vs. Optimal Reference RangesEU/mL
Standard reference intervals represent the statistical 95% distribution of unselected commercial populations. Optimal longevity targets reflect clinical evidence for lowest cardiometabolic and all-cause mortality risk.
Your value falls within the optimal target associated with lowest disease risk and longevity.
<20.0 EU/mL (negative)
General reference distribution across unselected commercial populations.
<10.0 EU/mL
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Activates neutrophils to undergo respiratory burst, release reactive oxygen species, and cause necrotizing small-vessel vasculitis.
Differential Diagnosis
Elevated Levels (c-ANCA / PR3 High)
- •Granulomatosis with Polyangiitis (GPA)
- •Necrotizing crescentic glomerulonephritis
- •Microscopic polyangiitis (minority)
Low Levels (c-ANCA / PR3 Low)
- •Quiescent vasculitis remission
- •Normal healthy vasculature
Technical Reference & Deep Dive
Biochemistry & Enzymatic Pathways
Longevity Risk Architecture & Epidemiology
Pre-Analytical Caveats & Diagnostic Workup
Pre-Analytical Considerations:
Specimen collection should follow standardized phlebotomy protocols. Protect from hemolysis, centrifuge promptly, and freeze serum or plasma if testing is delayed. Patient should be in a resting, fasting state where indicated.
Reflexive Testing Protocol:
- Confirmatory testing and secondary biomarker quantification for c-ANCA / PR3
- Targeted organ system imaging or functional dynamic testing related to granulomatosis with polyangiitis
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Cytoplasmic ANCA (Anti-Proteinase 3) - The New England Journal of Medicine (2021). PMID: 33990124
- [2]c-ANCA / PR3 Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35222901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Cytoplasmic ANCA (Anti-Proteinase 3) (c-ANCA / PR3) into overall healthspan optimization.