| Test Code | 1580 |
| Turnaround Time (TAT) | 2-4 weeks |
| Number of Genes | 1 |
for all blood relatives of patients who undergo full single gene sequencing or multigene panel testing* at Ambry Genetics and are found to have a pathogenic or likely pathogenic variant. No-cost testing of blood relatives must be completed within 90 days of the original Ambry report date.
Order Now*excludes Secondary Findings and SNP Array tests
Genetic testing of PHOX2B will detect a mutation in >99% of people with CCHS (clinical sensitivity). Ambry's PHOX2B analysis can detect >99.9% of described mutations in the gene, when present (analytical sensitivity).
Our PHOX2B full gene sequence analysis is performed by PCR-based double-stranded automated sequencing in the sense and antisense directions for exons 1-3 of the PHOX2B gene, plus at least 5 bases into the 5’ and 3’ ends of all the introns. Alanine repeat numbers for the commonly-expanded region in exon 3 are determined and reported in all cases.