GFAP and Alzheimer disease: In AD continuum, levels of plasma GFAP were 285.0 [142.6] pg/mL, 332.5 [153.6] pg/mL, 388.1 [152.8] pg/mL, and 185.1 [93.5] pg/mL in cognitive unimpaired Aβ positive cohorts, MCI, AD, and Aβ negative cognitively normal cohorts, respectively [159].