Participants with a confirmed molecular diagnosis of Multiple Acyl-CoA Dehydrogenase Deficiency (MADD) will complete annual follow-ups (or every 6 months for participants under 2 years of age). Participants with a biochemical diagnosis, but without a molecular diagnosis, will complete baseline evaluations and will not complete further annual assessments if a molecular diagnosis is not made following the baseline evaluations. Study activities will involve standard of care clinical assessments and medical record data abstraction for such assessments, as well as research-specific assessments, questionnaires, and sample collection.
