CHIP Variant Allele Fraction (CHIP VAF)
Next-generation sequencing detection of somatic leukemogenic mutations (DNMT3A, TET2, ASXL1, JAK2) in peripheral blood without overt hematological malignancy.
Standard vs. Optimal Reference Ranges% VAF
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.
<2.0% VAF (undetectable somatic mutation)
General reference distribution across unselected commercial populations.
Negative (<0.5% VAF)
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Mutant hematopoietic stem cell clones expand with aging, giving rise to inflammatory macrophages with hyperactive NLRP3 inflammasome signaling.
Differential Diagnosis
Elevated Levels (CHIP VAF High)
- •Clonal Hematopoiesis of Indeterminate Potential (CHIP, high risk of ASCVD and myeloid malignancy)
- •TET2 or DNMT3A somatic mutation
Low Levels (CHIP VAF Low)
- •Absence of clonal hematopoietic expansion (<0.5% VAF)
- •Optimal stem cell fidelity
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 CHIP VAF
- Targeted organ system imaging or functional dynamic testing related to clonal hematopoiesis of indeterminate potential
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of CHIP Variant Allele Fraction - The New England Journal of Medicine (2021). PMID: 34190124
- [2]CHIP VAF 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 CHIP Variant Allele Fraction (CHIP VAF) into overall healthspan optimization.