Beta amyloid 42/40 ratio, CSF

Alphabetical Test listing

Beta amyloid 42/40 ratio, CSF-994

This assay requires a special tube at collection, and a minimum of 5.0 mL of CSF

Beta amyloid 42/40 ratio, CSF

To indicate the ratio of beta-amyloid 42 proteins to beta-amyloid 40 proteins measured in the CSF to aid in the assessment of disease progression in patients with suspected or probable Alzheimer's disease.

Cerebrospinal fluid (CSF)

Sarstedt Liquor CSF tube

  • This specific tube is required.
  • Use of a different collection container can affect results.
8.0 mL
5.0 mL
  • Collect Cerebral Spinal Fluid (CSF) in a Sarstedt Liquor CSF tube.
  • Tube must be filled 50%-80% minimum.

Refrigerate immediately (preferred), or within 8 hours


Sarstedt Liquor CSF tube


Refrigerated (preferred) – 8 days

Ambient – 8 hours

Frozen – 30 days

Freeze/thaw cycles - stable x1

  • Wrong tube type
  • Not stored at proper temperature
  • Quantity not sufficient (QNS)
Monogram Biosciences via LabCorp (505505): R-NX
7 days

Chemiluminescent enzyme immunoassay (CLEIA)


Beta-amyloid 42/40 (ratio):  0.058


See report for interpretation

Not established