Amyloid Beta 42 Peptide details
What Amyloid Beta 42 Peptide shows
Amyloid beta 42 is a protein fragment produced in the brain that is especially prone to clumping into plaques, a hallmark of Alzheimer's disease. When plaques build up in the brain, less amyloid beta 42 tends to be found in your blood plasma. It is measured together with amyloid beta 40 so the two can be combined into the 42/40 ratio, which corrects for differences in how much amyloid each person makes. A lower amyloid beta 42 level can fit with plaque buildup, but on its own it is not reliable enough to interpret. The ratio is used for adults with memory or thinking concerns, and it is read by a clinician alongside symptoms and other assessments.
Tests that include Amyloid Beta 42 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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