Home
HelpTest 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
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube: Lavender top (EDTA)
Submission Container/Tube: Plastic screw-top vial
Specimen Volume: 0.6 mL plasma
Collection Information: Centrifuge and aliquot plasma into plastic vial. Do not submit in original tube.
Secondary ID
621635Method Name
Chemiluminescent Enzyme Immunoassay
Specimen Type
EDTA PlasmaSpecimen Minimum Volume
Plasma: 0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| 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 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
84393
Forms
If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:
-Neurology Specialty Testing Client Test Request (T732)
-General Test Request (T239)