Test directory: Phosphorylated tau181, Plasma

Ordering Code 8639
Test Name Phosphorylated tau181, Plasma
Alias Quest AD-Detect Phosphorylated tau181 (p-tau181),
Plasma
PhosphoTau-181P
Preferred Specimen Plasma
Preferred Container EDTA, K2 (Lavender)
Optimum Volume 1 mL
Collection Instructions Dietary supplements containing biotin may interfere in assays and may affect results. If taking biotin supplements, draw samples at least 8 hours following the last daily dose biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last mega-dose of biotin supplementation.
Transport Requirements Oahu: Ambient
Airline: Ambient
Specimen Stability Ambient: 14 Days
Refrigerated: 22 Days
Frozen: 22 Days
Rejection Criteria Hemolyzed
Avail. Stat NO
Analytic Time 7 Days
Methodology Electrochemiluminescence (ECLIA)
Reference Lab  Quest Diagnostic Lab-NI

Reference range(s)

The reference ranges listed below are valid on this date of June 25, 2026.
Component Age Male Norm Male Critical Low Male Critical High Female Norm Female Critical High Female Critical Low Units Add'l info
AD Detect p-tau181, P ALL See report.