Circulating Cell-Free DNA (cfDNA)
Extracellular fragmented genomic DNA (160 to 180 base pairs, corresponding to chromatosome units) circulating in plasma.
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.
<10.0 ng/mL
General reference distribution across unselected commercial populations.
<5.0 ng/mL
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Released during apoptosis, necrosis, and neutrophil extracellular trap (NET) formation (NETosis); acts as an endogenous danger-associated molecular pattern (DAMP).
Differential Diagnosis
Elevated Levels (cfDNA High)
- •High systemic cell death / tissue trauma
- •Active metastatic malignancy (tumor-derived ctDNA fraction)
- •Severe sepsis and multi-organ failure
- •Active systemic lupus erythematosus
Low Levels (cfDNA Low)
- •Low systemic cell turnover (<5.0 ng/mL)
- •Optimal cellular homeostasis
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 cfDNA
- Targeted organ system imaging or functional dynamic testing related to systemic cell death & sterile necrosis
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Circulating Cell-Free DNA - The New England Journal of Medicine (2021). PMID: 34190124
- [2]cfDNA 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 Circulating Cell-Free DNA (cfDNA) into overall healthspan optimization.