Clinical Context
A pediatric or adult patient presents with an unexplained, likely genetic condition (for example, developmental delay, multiple congenital anomalies, progressive neurologic decline, cardiomyopathy of unclear etiology, or suspected mitochondrial disorder). Prior targeted testing (chromosomal microarray, single-gene testing, or targeted gene panels) is non-diagnostic or inconclusive. The ordering clinician (medical geneticist, genetic counselor, pediatric neurologist, or other specialist) documents a proband-focused evaluation and requests a comprehensive analysis of the whole genome including mitochondrial DNA. A blood or saliva specimen is collected per the laboratory’s instructions and sent to Variantyx Inc. for the Genomic Unity® Whole Genome Analysis – Proband (0212U). The laboratory performs whole genome sequencing and mitochondrial DNA analysis, bioinformatic variant calling and interpretation, and issues a clinical report summarizing pathogenic or likely pathogenic variants, variants of uncertain significance relevant to the phenotype, and recommended follow-up. Results are returned to the ordering clinician, who integrates findings with clinical data to guide diagnosis, cascade testing of family members if indicated, management, and possible referral for specialty care or clinical trial consideration. Typical sites of service include outpatient clinics, specialty genetics centers, and hospital outpatient draw stations; specimen collection may also occur in an inpatient setting for hospitalized patients with urgent diagnostic needs.