Genetic testing in pediatric epilepsy evaluation is most helpful in which scenarios?

• A. Only after a 20-year history of seizures
• B. Never useful
• C. Early-onset, treatment-resistant, syndromic presentations or when family history suggests a genetic syndrome
• D. Only after imaging shows a lesion

Answer: (C)

Genetic testing in pediatric epilepsy is most helpful when seizures start very early and are hard to control, or when the clinical picture suggests a genetic syndrome or there’s a family history pointing to a genetic cause. In these scenarios, identifying the specific genetic cause can change management, prognostication, and family counseling. For example, some genetic epilepsies respond to targeted therapies or avoid certain drugs that can worsen the condition, and knowing the exact mutation helps clinicians choose the most effective treatments and dietary approaches. It also provides information about recurrence risk for siblings and future children, and may guide testing for other family members. Imaging findings can be non-specific or even normal in genetic epilepsies, so relying solely on imaging may miss an underlying genetic cause. In contrast, if seizures begin later in life, are easily controlled, or there’s no syndromic pattern or family history, the yield from genetic testing is much lower.