This single institution study identified that only 25% of infants with CHD underwent cytogenetic testing, indicating possible underutilization of testing in this age group. The high multiple testing rate indicates a need for improved guidelines for cost effective testing approaches. The diagnostic yield in this study suggests that CMA is a particularly useful first screening test when a specific syndrome is not clinically identifiable. Larger studies investigating cardiac lesion-specific diagnostic yield in isolated CHD are warranted.
These specified non-coding mutations were found in a significant number of North American patients and inclusion of them in mutation analysis will improve the molecular diagnosis of FHL3.
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