EFO_0004614 (apolipoprotein A 1 measurement) is is a quantification of apolipoprotein A 1 in a sample. It is encoded in humans by the APOA1 gene and is the major protein component of high density lipoprotein (HDL) in plasma. Apolipoprotein A 1 relates to lower observational risk of coronary artery disease. Also known as: apo-AI levels, apoA-I levels, apolipoprotein A-1 levels, apolipoprotein A-I levels, apolipoprotein A1 levels.