Amyloid Beta 40 Peptide details
What Amyloid Beta 40 Peptide shows
Amyloid beta 40 is the most abundant form of amyloid beta, a protein fragment that is produced in the brain and other tissues and can be measured in your blood plasma. It tends to stay relatively steady in people with and without Alzheimer's-related changes. This is why its main use is as a reference point: it is measured together with amyloid beta 42, and the two are combined into the 42/40 ratio. On its own, a higher or lower amyloid beta 40 level has little meaning for Alzheimer's risk, and it is not interpreted separately. The ratio is intended for adults with memory or thinking concerns, as part of a wider assessment by a clinician.
Tests that include Amyloid Beta 40 Peptide
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.
- Amyloid Beta 40 Peptide Measures amyloid beta 40 in plasma, a common protein fragment from the brain used together with amyloid beta 42 to calculate the 42/40 ratio.
- Amyloid Beta 42/40 Ratio A ratio calculated from amyloid beta 42 and amyloid beta 40 in plasma, used to help estimate the likelihood of amyloid plaques in the brain.
- Amyloid Beta 42 Peptide Measures amyloid beta 42 in plasma, the protein fragment that forms plaques in the brain in Alzheimer's disease, used to calculate the 42/40 ratio.
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