# Blood Alzheimer biomarkers

Source: https://onco.cc/technologies/da-tech-blood-biomarkers/  
OnCo record `da-tech-blood-biomarkers` (Technology). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Blood tests may help decide who needs a scan or spinal-fluid test. They are not a home diagnosis.

## Summary

Plasma p-tau and amyloid assays are entering clinical pathways in some systems. Cut-offs, comorbidities, and kit differences still matter.

## Fields

- Kind: Technology
- Status: emerging
- Last checked: 2026-09-21
- Tags: dementia-atlas
- Principle: Plasma assays estimate amyloid or phosphorylated tau species.

## Sources

- NIA: https://www.nia.nih.gov/health/alzheimers-and-dementia

## Connected records

- ideas: [Blood test before PET or lumbar puncture](https://onco.cc/ideas/da-idea-blood-first-triage/)
- diagnoses: [Alzheimer’s disease](https://onco.cc/diagnoses/alzheimers-disease/), [Mild cognitive impairment](https://onco.cc/diagnoses/mild-cognitive-impairment/)
- fronts: [Fluid biomarkers](https://onco.cc/fronts/da-front-fluid-biomarkers/)

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