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Test Code ZG355 Beta-Amyloid 42/40 Ratio (Quest)

Important Note

These are collection and handling instructions for approved testing at Quest Diagnostics.

Additional Codes

Quest:11786

Methodology

Liquid Chromatography/Tandem Mass Spectometry (LC/MS/MS)

Performing Laboratory

Quest Diagnostics

Specimen Requirements

Phlebotomist:

Container/Tube: Lavender-top or Pink-top (EDTA) tube

Specimen Volume: 1.2 mL of EDTA plasma

Spin and pour off, freeze within 1 hour

 

Processing:

Place frozen specimen in the Quest tray in the freezer. Call Quest for pick-up.

Specimen Transport Temperature

Frozen

Specimen Stability Information

Temperature Time
Refrigerated 72 hours
Frozen 32 days
Ambient Unacceptable

 

Day(s) Test Set Up

Set up Sunday; Report available 3-12 days.

 

Test Classification and CPT Coding

TBD

Reference Values

ABeta 42: Not Established

ABeta 40: Not Established

ABeta 42/40 Ratio: > 0.170

 

Note: Quest Diagnostics does not perform this test for individuals under the age of 18.