p-Tau 181 / 217 (Plasma)
Phosphorylated tau (p-Tau 181 and 217) is a blood biomarker highly specific to Alzheimer's disease pathology, reflecting the tau protein changes that accompany the disease. A longevity practice tracks these emerging markers because they correlate closely with amyloid burden and can flag risk early.
What It Measures
Phosphorylated tau plasma biomarker for Alzheimer's pathology.
Optimal vs. Lab Range
Target range for optimal health and longevity based on research.
Population-based reference range from standard labs.
Why It Matters
Highly specific for AD pathology; predicts amyloid PET positivity.
When Low
—
When Optimal
Below cutoff → low AD probability.
When High
Elevated → AD pathology likely; neurology referral.
How to Optimize
MIND diet, ≥150 min/wk aerobic, sleep, social engagement, hearing aids if needed.
Key Interventions & Linked Compounds
Strong (9/10)Key Interventions
Linked Compounds & Supplements
Curated from clinical literature. Individual results vary; consult a qualified clinician before changing a protocol.
Ordering Notes
Specimen
Serum or plasma (venous draw)
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
pg/mL
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 p-Tau 181 / 217 (Plasma).
- 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.
Quick Actions
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