Summary: \nThis experiment measures serum and plasma concentrations of non-esterified fatty acids using a 96-well kit. The experiment involves a coupled reaction to measure non-esterified fatty acids (NEFA) which ultimately forms a purple product that absorbs light at 550nm. This allows the concentration of NEFA to be determined from the optical density measured at 540~550nm. Serum fatty acids levels reflect systemic lipid metabolism, lipid digestion\/absorption, and lipid clearance. Serum fatty acids levels are altered in obesity, insulin resistance, and type 2 diabetes.