Thus, CPT-II deficiency was characterized by decreased d27-C14/d31-C16, d23-C12/d27-C14, and d23-C12/d31-C16 ratios, whereas VLCAD deficiency was characterized by increased d27-C14/d31-C16 and decreased d23-C12/d27-C14 and d23-C12/d31-C16 ratios. The gene discussed is CPT2; the disease is very long chain acyl-CoA dehydrogenase deficiency.