The National Human Genome Research Institute's Undiagnosed Diseases Program (UDP) requires CLIA-certified laboratory testing and expert interpretation services to support diagnostic evaluations of patients with rare, complex genetic and metabolic conditions. The contractor will perform specialized biochemical, molecular, and metabolomic analyses on submitted specimens, including mitochondrial disease evaluations, metabolic testing, and tissue-based studies. Services also include written reports with test interpretations and immediate notification of critical findings, as well as ongoing technical consultation. No submission timelines, budget amounts, or performance location are specified in the description.