Amyloid measures across plasma, CSF and PET scans Lead Investigator: Randy Bateman Institution : Wash U ADC E-Mail : batemanr@wustl.edu Proposal ID : 966 Proposal Description: We hypothesize that plasma amyloid-beta 42/40 ratio is decreased in those with CNS amyloidosis. The specific aim is to test plasma amyloid-beta levels and compare to CSF measures of abeta and also compare to PET measures of amyloidosis.