Quantification of the amount of soluble TREM2 (triggering receptor expressed on myeloid cells 2) protein in a sample. Cerebrospinal fluid sTREM2 is used as a biomarker of disease pathogenesis in Alzheimer's disease. The trait is EFO_0010151 (soluble triggering receptor expressed on myeloid cells 2 measurement). Also known as: sTREM2 measurement.