The underlying diagnoses were MCADD (3), VLCADD (1), MADD (2), long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency (LCHAD) (1), carnitine palmitoyltransferase II (CPT2) deficiency (2), carnitine-acylcarnitine translocase (CACT) deficiency (1), and HLCSD (1) (Table 2). The gene discussed is CPT2; the disease is hyperinsulinemic hypoglycemia, familial, 4.