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.

Sarstedt Liquor CSF tube

• This specific tube is required.
• Use of a different collection container can affect results.

• 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

Chemiluminescent enzyme immunoassay (CLEIA)

See report for interpretation