Multiple Acyl-CoA Dehydrogenase Deficiency (MADD), also known as Glutaric Acidemia type II (GAII), is an autosomal recessive disorder caused by pathogenic variants in the genes encoding the electron transfer flavoprotein (ETF) or its dehydrogenase (ETFDH). The gene discussed is ETFDH; the disease is multiple acyl-CoA dehydrogenase deficiency.