Plasma C3a Anaphylatoxin (C3a)
77-amino-acid peptide cleaved from the alpha-chain of C3 by C3 convertases during initial complement amplification.
Standard vs. Optimal Reference Rangesng/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.
<50.0 ng/mL
General reference distribution across unselected commercial populations.
<20.0 ng/mL
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Binds C3aR on mast cells and basophils, triggering immediate degranulation, smooth muscle contraction, and increased vascular permeability.
Differential Diagnosis
Elevated Levels (C3a High)
- •Active systemic lupus erythematosus flare
- •Immune complex-mediated glomerulonephritis
- •Acute allergic and anaphylactoid reactions
Low Levels (C3a Low)
- •Quiescent C3 convertase activity
- •Absence of active complement cleavage
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 C3a
- Targeted organ system imaging or functional dynamic testing related to mast cell anaphylatoxin
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Plasma C3a Anaphylatoxin - The New England Journal of Medicine (2021). PMID: 34190124
- [2]C3a Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35422901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Plasma C3a Anaphylatoxin (C3a) into overall healthspan optimization.