Dilute Russell Viper Venom Time Ratio (dRVVT Ratio)
Functional in vitro clotting assay using venom that directly activates Factor X, sensitive to phospholipid-dependent coagulation inhibitors.
Standard vs. Optimal Reference RangesRatio
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.
<1.20 (normalized ratio)
General reference distribution across unselected commercial populations.
<1.10
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Venom Factor X activator requires phospholipids; circulating antiphospholipid antibodies prolong clotting time, which fails to correct with normal plasma mix.
Differential Diagnosis
Elevated Levels (dRVVT Ratio High)
- •Positive Lupus Anticoagulant (strong prothrombotic risk in vivo despite in vitro prolonged clotting)
- •Antiphospholipid syndrome
Low Levels (dRVVT Ratio Low)
- •Direct oral anticoagulant (DOAC) interference (false positive)
- •Normal functional phospholipid coagulation
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 dRVVT Ratio
- Targeted organ system imaging or functional dynamic testing related to functional antiphospholipid coagulopathy
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Dilute Russell Viper Venom Time Ratio - The New England Journal of Medicine (2021). PMID: 33990124
- [2]dRVVT Ratio 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 Dilute Russell Viper Venom Time Ratio (dRVVT Ratio) into overall healthspan optimization.