Low Rates of Genetic Testing in Children With Developmental Delays, Intellectual Disability, and Autism Spectrum...

Area of Science:

• Pediatric Genetics
• Medical Education
• Diagnostic Medicine

Background:

• Intellectual disability and developmental delay (ID/DD) often have underlying genetic causes.
• Effective utilization of genetic testing is crucial for accurate diagnosis and management of ID/DD.
• Current physician practices regarding genetic testing for ID/DD are not well-documented.

Purpose of the Study:

• To assess the routine and effective use of genetic testing in pediatric patients with ID/DD.
• To evaluate physician diagnostic accuracy and testing patterns in simulated genetic illness cases.
• To identify gaps in physician knowledge and application of genetic testing for ID/DD.

Main Methods:

• A prospective, randomized observational study involving 231 pediatricians and specialists.
• Simulated patients with 9 rare pediatric genetic illnesses were used to assess care responses.
• Physician care was scored against evidence-based criteria, with a focus on diagnostic accuracy and testing orders.

Main Results:

• Overall care scores varied widely, with a median of 44.7%.
• Diagnostic accuracy was low, with only 27.4% of physicians identifying the correct primary diagnosis.
• Genetic testing, including chromosomal microarray analysis and specific gene sequencing, was underutilized.

Conclusions:

• Genetic testing for ID/DD is significantly underutilized by physicians.
• Physician education on the clinical utility of genetic testing is needed to improve diagnosis and patient care.
• Enhanced training may lead to better identification of genetic causes for ID/DD.