These ELISA kits detecting beta amyloid (1-42) and (x-42)* that ensure highly sensitive detection. These beta amyloids are indicated to have a correlation with Alzheimer’s disease. Detection sensitivity of the kits is about 10 times higher than that of the existing productsand the dynamic range is from 0.1 to 20 pmol/L. Fab’ fragment of the labeled antibody is used as well as so that the nonspecific binding is reduced.*: beta Amyloid (x-42) is beta Amyloid peptide modified or cleaved at the N-terminal.