Biomarkers · Chemical
Elecsys pTau-181
- Primary unit
- pg/mL
- LOINC codes
- 103675-5
- Tests that measure Elecsys pTau-181
- Labcorp 2, Quest Diagnostics 1
Ranges
Each lab publishes a reference range for the population groups it tests, usually the middle 95% of results. These intervals describe that population, not an optimal or healthy target. How ranges differ
Labcorp, Elecsys® pTau-181, Plasma 452560
| Population | Interval |
|---|---|
| pTau-181 result | Interpretation |
| Negative (≤0.722pg/mL) | A negative result is consistent with a negative amyloid PET scan result. These patients should be investigated for causes of cognitive decline other than amyloid pathology. |
| Positive (>0.722 pg/mL) | A positive result may not be consistent with a positive amyloid PET scan result. Patients with an initial positive result should be further investigated to determine whether amyloid pathology can be a cause of cognitive impairment. |
Tests
Check the catalog code, specimen, method and preparation for every test that measures Elecsys pTau-181. Select up to five tests to compare them side by side.
Labcorp 2 tests
Single-analyte tests
Elecsys® pTau-181, Plasma 452560
Plasma · Fasting not stated · Turnaround 2 - 5 days
Labcorp catalog pageMethod and collection
- Method
- Roche Diagnostics Electrochemiluminescence Immunoassay (ECLIA)
- Collection
- Draw blood in lavender-top (EDTA) tube. Invert to mix with preservatives. Centrifuge and transfer plasma to a labeled plastic transport tube.
Panels that include this biomarker
ATN Profile 484400
4 analytes · Plasma · Fasting not stated · Turnaround 7 - 10 days
Labcorp catalog pageMethod and collection
- Method
- Sysmex chemiluminescence enzyme immunoassay (CLEIA) and Roche Diagnostics electrochemiluminescence immunoassay (ECLIA)
- Collection
- Draw two full lavender-top (EDTA) tubes of blood. Separate plasma from blood via centrifugation (>1500g for 10 minutes) within 40 minutes after blood collection. Transfer plasma to two Labcorp polypropylene transport tubes and seal.
Quest Diagnostics 1 test
Single-analyte tests
Quest AD-Detect® Phosphorylated tau181(p-tau181), Plasma 13690
Plasma · Fasting not stated · Turnaround Set up: Mon-Sat
Quest Diagnostics catalog pageMethod and collection
- Method
- Electrochemiluminescence (ECLIA)
- Preparation
- Dietary supplements containing biotin may interfere in assays and may skew results to be either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation.
- Reference notes
- ≤0.72 pg/mL
0 of 5 tests selected
Pick one moreSources
2 tests: codes, specimens, methods, preparation and reference intervals.
Quest Diagnostics test catalog
1 test: codes, specimens, methods, preparation and reference intervals.
LOINC 103675-5
Regenstrief Institute codes that identify the same result across labs.
Search ClinicalTrials.gov for Elecsys pTau-181
Registered studies that measure Elecsys pTau-181, on the U.S. National Library of Medicine registry.
Verify these ranges and sources
We compile this page from named laboratory catalogs, guidelines and studies. Labs calculate reference intervals from the people they test, for one assay method and one population group, so an interval describes that population rather than an optimal target.
Interpret your own results with a licensed clinician, or track your lab history and health goals in Aumnivida.
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