High-Sensitivity C-Reactive Protein (hs-CRP)
High-sensitivity C-reactive protein is an acute-phase reactant synthesized by the liver in response to interleukin-6 (IL-6). It quantifies basal microvascular inflammation and independent cardiovascular hazard.
Standard vs. Optimal Reference Rangesmg/L
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.
< 3.0 mg/L
General reference distribution across unselected commercial populations.
< 0.5 mg/L
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Pro-inflammatory cytokines (IL-1beta and IL-6) stimulate hepatic CRP transcription. Circulating CRP opsonizes apoptotic cells and binds endothelial Fc-gamma receptors, downregulating endothelial nitric oxide synthase (eNOS) and promoting leukocyte adhesion.
Differential Diagnosis
Elevated Levels (hs-CRP High)
- •Subclinical vascular atherosclerosis
- •Active bacterial or viral infections
- •Autoimmune diseases (Rheumatoid arthritis, Lupus)
- •Visceral adiposity and metabolic syndrome
Low Levels (hs-CRP Low)
- •Absence of systemic inflammatory cascades
- •Hepatic failure (impaired synthesis capacity)
- •High-dose statin or anti-inflammatory biologic therapy
Technical Reference & Deep Dive
Biochemistry & Enzymatic Pathways
Longevity Risk Architecture & Epidemiology
Pre-Analytical Caveats & Diagnostic Workup
Pre-Analytical Considerations:
Standard testing requires a 10 to 12 hour overnight fast to minimize postprandial chylomicron interference, although hs-CRP direct immunoassay is less sensitive to prandial state than calculated LDL-C. Avoid strenuous high-intensity exercise 24 hours prior to blood draw. Serum separator tubes (SST) or EDTA plasma should be centrifuged within 2 hours. High-dose biotin (>5 mg/day) supplementation may interfere with competitive streptavidin-biotin immunoassays, requiring a 48-hour washout period.
Reflexive Testing Protocol:
- Advanced Lipoprotein Particle Quantification (NMR spectroscopy or ion mobility LDL-P)
- Lipoprotein(a) [Lp(a)] baseline evaluation for genetic cardiovascular risk stratification
- Coronary Artery Calcium (CAC) score via non-contrast cardiac CT to evaluate calcified plaque burden
- High-sensitivity C-Reactive Protein (hs-CRP) to assess systemic vascular inflammatory tone
- Carotid intima-media thickness (CIMT) duplex ultrasound to assess subclinical atherosclerosis
Clinical Citations & Primary Literature (1)
- [1]Inflammation, C-Reactive Protein, and Cardiovascular Risk - New England Journal of Medicine (2020). PMID: 32243118
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate High-Sensitivity C-Reactive Protein (hs-CRP) into overall healthspan optimization.