beta-amyloid 1-42 measurement (Experimental Factor Ontology identifier EFO_0004670) is is the quantification of Beta-amyloid 1-42 in cerebrospinal fluid typically used as a biomarker for Alzheimer's Disease. Also known as: CSF AB1-42 levels, CSF Aβ1-42 levels, amyloid-beta 1-42 measurement.