Oleic Acid-13C is intended for use as an internal standard for the quantification of oleic acid by GC- or LC-MS. Oleic Acid (T2O2668) is a monounsaturated fatty acid and a major component of membrane phospholipids that has been found in human plasma,cell membranes,and adipose tissue.1,2 It contributes approximately 17% of the total fatty acids esterified to phosphatidylcholine,the major phospholipid class in porcine platelets.1 Oleic acid inhibits collagen-stimulated platelet aggregation by approximately 90% when used at a concentration of 10 μg/ml. It also inhibits fMLF-induced neutrophil aggregation and degranulation by 55 and 68%,respectively,when used at a concentration of 5 μM,similar to arachidonic acid .3 Oleic acid (60 μM)induces release of intracellular calcium in human platelets.4