Home
HelpTest Code PT217M Phospho-Tau 217, Plasma
Additional Codes
| Mayo | PT217M |
| Epic ID | LAB4816 |
Specimen Type
EDTA PlasmaOrdering 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.
Specimen 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 |
Transport refrigerated.
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
| Gross icterus | OK |
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Method Name
Chemiluminescent Enzyme Immunoassay
Useful For
Evaluation of individuals, aged 50 years and older, presenting with cognitive impairment who are being assessed for Alzheimer disease and other causes of cognitive decline
This test is not intended as a screening test for Alzheimer disease in asymptomatic individuals.
Day(s) Performed
Monday through Friday
Report Available
1 to 3 daysReference Values
Negative: ≤0.185 pg/mL
Intermediate: 0.186-0.324 pg/mL
Positive: ≥0.325 pg/mL
CPT Code Information
84393