Test Directory

• Beta-Amyloid Ratio
• Beta-Amyloid Ratio Interpretation

Assisting in the evaluation of adult patients, aged 55 years and older, presenting with cognitive impairment and are being assessed for Alzheimer disease and other causes of cognitive decline

This test is not intended as a screening or stand-alone diagnostic assay.

Specimen Type: Cerebrospinal Fluid

Collection Container: Alzheimer's Disease Evaluation CSF Kit (BlueTop SARSTEDT)

Desired Specimen Volume: 2.5 mL

1. Collect CSF via lumbar puncture.
2. Discard the first 1 to 2 mL of CSF.
3. Discard any CSF visibly contaminated with blood.
4. Collect CSF directly into the blue top Sarstedt tube included in the Alzheimer's Disease Evaluation Kit.

MCL Spinal Fluid Specimen Collection may be reviewed

1. Transport 2.5 mL of CSF in the original collection tube provided with kit (BlueTop SARSTEDT).

This test is intended for use in adult patients aged 55 years and older. 

Transport to the laboratory refrigerated. 

• Gross hemolysis
• Gross lipemia,
• Gross icterus
• Polystyrene collection tubes

See patient report.

Exposure of CSF to polystyrene tubes may result in falsely low beta-amyloid concentrations.

• Beta-Amyloid Ratio (1-42/1-40), Spinal Fluid
• Amyloid Beta 42
• Beta-Amyloid 42
• Amyloid Beta 40
• Beta-Amyloid 40
• Amyloid ratio
• Ab42/Ab40 ratio