Casandra
Casandra Test Code QD65240Version 1 (DRAFT)
Performing Lab
Lab Quest DiagnosticsLab Test ID 13690
Quest AD‑Detect® Phosphorylated tau181 (p‑tau181), Plasma
Also known as: PhosphoTau-181P
Clinical Use
Order TestUse
This test detects phosphorylated tau181 (p‑tau181) proteins, which are hallmark biomarkers involved in the diagnosis and staging of Alzheimer’s disease. Plasma concentrations of p‑tau181 increase over time as Alzheimer’s disease progresses, enabling less invasive, practical, and cost‑effective monitoring over time and helping guide care pathways and risk assessment for cognitive decline.
Special Instructions
Not provided.
Limitations
Not provided.
Test Details
New York Approved
Methodology
Immunoassay (ECLIA)
Biomarkers
p‑tau181
ProteinECLIA
Expression • Quantitative (Continuous) (e.g., copies/mL, % expression)
Result Turnaround Time
3-5 days
Related Documents
For more information, please review the documents below
Specimen Requirements
Specimen
Plasma
Volume
1.0 mL of EDTA plasma
Minimum Volume
Not provided
Container
Lavender‑top or Pink‑top (EDTA) tube
Collection Instructions
Spin and pour off, keep at room temp
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 14 days |
| Refrigerated | 22 days |
| Frozen | 22 days |
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