A digital enzyme-linked immunosorbent assay for ultrasensitive measurement of amyloid-β 1–42 peptide in human plasma with utility for studies of Alzheimer’s disease therapeutics

Table 5 Estimated amyloid-β 1–42 peptide content of nominal 0.25-ng masses of calibration standard

Calibration standard	Theoretical amount loaded (ng)	Mean amount measured (ng)	Relative error (%)	SEM
Quanterix^a	0.250	0.367	+47	8.1
Fujirebio^a	0.250	0.123	−51	7.3
Lilly^b	0.250	0.230	−8	15.0

ISSN: 1758-9193