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Phosphorylated Tau 181 (pTau-181), Plasma
MessageORDER AS A MISCELLANEOUS TEST
Test Code
483745 (LABCORP)
CPT Codes
83520
Preferred Specimen
1 mL EDTA Plasma
Patient Preparation
his test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for this test about biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.
Minimum Volume
0.7 mL (Note: This volume does not allow for repeat testing.)
Transport Temperature
Room Temperature
Specimen Stability
|
Room temperature |
14 days |
|
Refrigerated |
14 days |
|
Frozen |
14 days |
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Samples must be labeled with complete first and last name
Samples must be labeled with date of birth
Samples must be labeled with date of birth
Report Available
1-3 days
Limitations
This test was developed and its performance characteristics determined by Labcorp. It has not been cleared or approved by the Food and Drug Administration.
This test is performed by Roche Diagnostics Electrochemiluminescence Immunoassay (ECLIA). Values obtained with different assay methods or kits cannot be used interchangeably.
Hepatic and renal function impact concentrations of pTau-181.1,2
Results of plasma pTau-181 testing in patients with a history of myocardial infarction (MI) or clinical stroke should be interpreted with caution.2
Performing Laboratory
LabCorp
Last Updated: December 27, 2023
