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
  
994
  
LAB994
  
MSO
  
AduhelmTM
Alzheimers
  

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
  
07/27/2021
  
08/23/2021
  
07/27/2021