blood free fatty acid amount circulating fatty acid level Trait.ontology FFA level The proportion, quantity, or volume in whole blood, serum, or plasma of organic, monobasic acids derived from hydrocarbons, which are complexed with serum albumin for transport; they are saturated and unsaturated. VT:0001553 free fatty acids level CMO:0000117 CMO:0000546 CMO:0000547 circulating free fatty acids content blood lipid amount fatty acid amount