Beta amyloid 42/40 ratio, CSF

Alphabetical Test listing

Beta amyloid 42/40 ratio, CSF-14507

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

 

  
Beta amyloid 42/40 ratio, CSF
  
14507
  
LAB14507
  
Beta amyloid
  
AduhelmTM
Alzheimers
ADmark phospho-Tau/total-Tau/Ab42
  

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), within 8 hours of sample collection

  • Specimen must be collected in Sarstedt Liquor CSF tube; specimen cannot be aliquoted from another tube into the Sarstedt Liquor CSF tube
  • CSF in Sarstedt Liquor tube can only be used for Beta Amyloid 42/40 ratio testing; specimen cannot be aliquoted from liquor tube into a different tube for other testing
  

Sarstedt Liquor CSF tube

  

Refrigerated (preferred) – 8 days

Sample must be refrigerated within 8 hours of sample collection

Frozen  – 30 days

Freeze/thaw cycles - stable x1

  
  • Wrong tube type
  • Not stored at proper temperature
  • Quantity not sufficient (QNS)
  • Sample transferred from another tube
  • Gross hemolysis
  
LabCorp (505560): R-LC
  
10 days
  

Chemiluminescent enzyme immunoassay (CLEIA)

  

See report for interpretation

  
Not established
  
17026999
  
07/27/2021
  
06/28/2022
  
06/28/2022