ABeta 42

What it measures

Tests in the graph that measure it: 3

A plain-language description with its source has not been added for this biomarker yet. What the laboratories say about the tests that measure it is below.

Tests that measure ABeta 42

Quest AD-Detect Beta-Amyloid 4240 Ratio Plasma

Laboratory: Quest Diagnostics
Test code: 11786
Specimen: Plasma
Fasting: Not stated as required

What the laboratory says this test is for

This LC-MS/MS assay measures beta-amyloid 40 (AB40) as well as AB42 in plasma, rather than AB42 alone. This permits the normalization of beta amyloid levels circulating in plasma in different patients. Using the ratio of beta-amyloid 42/beta-amyloid 40, improves sensitivity and specificity for detecting Alzheimer's disease.

Quest Diagnostics test directory, test code 11786

AD-Detect p-tau217Beta-Amyloid 1-42 Ratio Plasma FDA Cleared

Laboratory: Quest Diagnostics
Test code: 17970
Specimen: Plasma
Fasting: Not stated as required

What the laboratory says this test is for

AD-Detect™ p-tau217/Beta-Amyloid 1-42 Ratio, Plasma (FDA Cleared) is cleared by the FDA for assessment of patients aged >=50 years with signs or symptoms of cognitive decline. The levels of two proteins, p-tau217 and Beta-amyloid 1-42, are evaluated within the plasma and calculated into an analytical ratio. This ratio is correlated to the presence or absence of amyloid plaques in the patient's brain, which may reduce the need for an amyloid-PET scan.

Quest Diagnostics test directory, test code 17970

Beta-Amyloid 4240 Ratio CSF

Laboratory: Quest Diagnostics
Test code: 94627
Specimen: Csf
Fasting: Not stated as required

What the laboratory says this test is for

This LC-MS/MS assay measures beta-amyloid 40 (AB40) as well as AB42 in cerebrospinal fluid (CSF), rather than AB42 alone. This permits the normalization of beta amyloid levels circulating in CSF in different patients. Using the ratio of beta-amyloid 42/beta-amyloid 40, improves sensitivity and specificity for detecting Alzheimer's disease.

Quest Diagnostics test directory, test code 94627

About this page

Everything above is drawn from the named sources and shown as they published it. Reference ranges belong to the laboratory that issued them and the population it named; they are not a universal normal. This page describes the biomarker in general and does not interpret anyone's result. For your own numbers, talk to a clinician, or use Aumnivida, which reads the same graph next to your records.

Found an error? Write to hello@biomarkerlens.com with the page link and the source that contradicts it.