Only two fatty acids (linoleic acid and α linolenic acid) must be taken in the diet. Linoleic acid is an omega-6 fatty acid plentiful in the diet and α-linolenic acid (e.g., flax seed oil) is an omega-3 fatty acid more difficult to obtain in modern Western diets. Theoretically, all other metabolic fatty acids can be made in the body from these two. However, low cofactor (vitamin and mineral) availability and low enzyme production may cause over or under production of derivative fatty acids. A blood essential fatty acid evaluation is the only way to determine adequacy of fatty acid intake and metabolism.
The turn around time for this test is 2-4 weeks, unless unforeseen circumstances arise.
Specimen Requirements
7 mL of whole blood in a green-topped sodium heparin tube is the absolute minimum. 10 mL of whole blood is preferred. Sample must be shipped within 2 days of collection and stored in the refrigerator.