The AlphaLISA® immunoassay kit for human Aβ40 enables the detection and quantitation of human Aβ40 in human cerebrospinal fluid and cell culture supernatants using a homogeneous AlphaLISA assay (no wash steps). The assay shows negligible cross-reactivity with other forms of Amyloid beta (i.e. Aβ1-38 and Aβ1-42).