Book excerpt: The guest editors have compiled expert authors to provide current updates on the clinical management of inborn errors of metabolism. Authors have contributed clinical review articles on the following topics: Inborn errors of metabolism overview: pathophysiology, manifestations, evaluation, and management; Inborn errors of metabolism with acidosis: organic acidemias and defects of pyruvate and ketone body metabolism; Inborn errors of metabolism with hyperammonemia: urea cycle defects and related disorders; Inborn errors of metabolism with hypoglycemia: glycogen storage diseases and gluconeogenesis defects; Inborn errors of metabolism with myopathy: defects of fatty acid oxidation and carnitine transport; Inborn errors of metabolism with seizures: defects of glycine and serine metabolism and co-factor related disorders; Inborn errors of metabolism with hepatopathy: metabolism defects of galactose, fructose, and tyrosine; Inborn errors of metabolism with cognitive impairment: metabolism defects of phenylalanine, homocysteine and methionine, purine and pyrimidine, and creatine; Inborn errors of metabolism with movement disorders: defects in metal transport and neurotransmitter metabolism; Inborn errors of metabolism involving complex molecules: lysosomal and peroxisomal storage diseases; Inborn errors of metabolism with complex phenotypes: mitochondrial disorders and congenital disorders of glycosylation; and Newborn screening: history, current status, and future directions.