Disorders of mitochondrial energy metabolism, or oxidative phosphorylation (OXPHOS) disorders, are characterized by reduced activity of one (isolated) or more (combined) mitochondrial respiratory chain complexes. Mitochondrial disorders are clinically heterogeneous, and phenotypes, which range in severity and progression, can involve single or multiple organ systems. In addition, PreventionGenetics offers a wide variety of genetic testing for inherited metabolic disorders, also known as inborn errors of metabolism. Our expert PhD team has assembled a robust metabolic and mitochondrial disorders genetic test menu. Panels specific to one disorder are available, as well as comprehensive metabolic panels that cover broader phenotypic features or groups of similar disorders. Quality genetic testing is imperative for characterizing rare diseases and can help make informed treatment decisions.