{"id":"p-tau181","name":"p-tau181 (Phosphorylated Tau 181)","shortName":"p-tau181","aliases":["p-tau181","pTau181","Phosphorylated Tau 181","P-Tau181, Plasma","Tau, Phosphorylated, 181","Elecsys pTau181","Lumipulse pTau181","Plasma p-tau181","Elecsys Phospho-Tau (181P) Plasma","Phospho-Tau (181P) Plasma","Phosphorylated Tau 181, Plasma","pTau-181"],"abbreviations":["p-tau181","pTau181","P-tau181","pT181p"],"loinc":[{"code":"103675-5","primary":true}],"specimen":"plasma","units":[{"ucum":"pg/mL","display":"pg/mL"}],"referenceRanges":[],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A form of tau protein in blood plasma. A result at or below the lab's cutoff makes amyloid changes less likely; a result above it calls for more testing.","url":"https://bloodtesttracker.com/markers/p-tau181","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}