Long-chain 3-hydroxyacyl-CoA dehydrogenase, or LCHAD, deficiency is a rare disorder of fatty acid metabolism that prevents the body from metabolizing certain types of fat. LCHAD deficiency usually first manifests in infants or young children as hypoketotic hypoglycemia, which is an episode of low blood sugar that can’t be compensated for by producing ketone bodies to obtain energy. Laboratory tests typically show low blood levels of glucose and ketone bodies, but the most important findings