Factor V Leiden
Factor V Leiden is an inherited clotting-factor variant that increases the tendency to form venous blood clots. A preventive practice tests it once because carriers face higher risk of deep vein thrombosis and pulmonary embolism, particularly around estrogen use, surgery, or prolonged immobility.
What It Measures
Variant predisposing to venous thromboembolism.
Optimal vs. Lab Range
Target range for optimal health and longevity based on research.
Population-based reference range from standard labs.
Why It Matters
Increases DVT/PE risk, especially with estrogen, surgery, immobility.
When Low
—
When Optimal
Negative → baseline risk.
When High
Heterozygous → 5x VTE risk; manage triggers.
How to Optimize
Avoid estrogen contraception if carrier; perioperative DVT prophylaxis.
Key Interventions & Linked Compounds
Strong (9/10)Key Interventions
Curated from clinical literature. Individual results vary; consult a qualified clinician before changing a protocol.
Ordering Notes
Specimen
Buccal swab or whole blood (EDTA)
Patient prep
No fasting required. Maintain usual diet and medications unless advised.
Recommended cadence
Re-test every 3–6 months when actively optimizing; annually for monitoring.
Reporting unit
genotype
Pre-analytic notes
Standardize draw time of day, hydration, and recent exercise. Note any acute illness, supplements, or hormonal therapies on the requisition.
Recommended Follow-Up Actions
- 1
Confirm the result is reliable
Repeat abnormal values before acting — preferably from the same lab, same time of day, and under consistent prep. Rule out acute illness, recent intense exercise, or medication effects that can shift Factor V Leiden.
- 2
Compare against optimal, not just lab range
Use the optimal window above as the target. Lab "normal" is built from the general population and often misses early dysfunction.
- 3
Pair with related markers
Order a complementary panel covering metabolic, inflammatory, and hormonal context to interpret this marker properly.
- 4
Discuss interventions with a clinician
Use the interpretation guidance above to frame the conversation. Bring trends, not just one datapoint, to your visit.
- 5
Re-test on a defined cadence
If a change is implemented, re-measure in 8–12 weeks for fast-moving markers, or 3–6 months for slower ones, to confirm response before escalating.
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