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Test Code PT217 Phospho-Tau 217, Plasma

Additional Codes

Synonym: 

Phospho-Tau 217

ptau217


Ordering Guidance


This assay is useful for individuals presenting with mild cognitive impairment or early dementia. Results must be interpreted in conjunction with other diagnostic tools such as neurological examination, neurobehavioral tests, imaging, and routine laboratory tests.

 

This assay should not be ordered for individuals younger than 50 years or in cognitively unimpaired individuals regardless of age.

 

This assay should not be used to predict the development of dementia or other neurologic conditions.



Specimen Required


Collection Container/Tube: Lavender top (EDTA)

Submission Container/Tube: Plastic screw-top vial

Specimen Volume: 0.6 mL

Collection Information: Centrifuge and aliquot plasma into plastic vial. Do not submit in original tube.


Secondary ID

621635

Method Name

Chemiluminescent Enzyme Immunoassay

Specimen Type

EDTA Plasma

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
EDTA Plasma Refrigerated (preferred) 14 days
  Frozen  90 days
  Ambient  72 hours

Reject Due To

Gross hemolysis Reject
Gross lipemia OK
Gross icterus OK

Reference Values

Negative: ≤0.185 pg/mL

Intermediate: 0.186-0.324 pg/mL

Positive: ≥0.325 pg/mL

Day(s) Performed

Monday through Friday

Report Available

1 to 3 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

83520