Evaluation and Management of Autism Spectrum Disorder in Children

Diagnostic Evaluation and Referral

The American Academy of Pediatrics recommends immediate referral for comprehensive diagnostic evaluation by a multidisciplinary team and simultaneous initiation of early intensive behavioral interventions when concerns for Autism Spectrum Disorder (ASD) are raised in a 3-year-old child, as interventions started before age 3 have greater impact than those begun after age 5 1, 2
The Modified Checklist for Autism in Toddlers-Revised with Follow-Up (M-CHAT-R/F) should be used as the primary screening tool, which requires a positive initial screen followed by a structured follow-up interview before proceeding to full diagnostic evaluation 3, 4
If either parent concerns exist or clinician observations identify red flags, proceed directly to comprehensive evaluation regardless of screening results 5, 4
The median time from concern to diagnosis is already too long, and ASD is typically not diagnosed until 3-4 years despite parents expressing concerns by 18 months 4

A multidisciplinary team should conduct the gold-standard evaluation, including autism-specific diagnostic instruments such as Autism Diagnostic Observation Schedule-Second Edition (ADOS-2) and Autism Diagnostic Interview-Revised (ADI-R) 6
Cognitive assessment using standardized intelligence testing, such as Mullen Scales of Early Learning, should be performed to identify cognitive strengths and weaknesses 6
Adaptive functioning assessment should be conducted to measure real-world adaptive skills and guide intervention planning 6
Communication evaluation should assess both receptive and expressive language, with particular attention to pragmatic/social language use 6, 7

The American Academy of Pediatrics recommends beginning interventions as soon as ASD is seriously considered, without waiting for formal diagnosis completion 1, 2
Integrated developmental and behavioral interventions should be implemented immediately, combining behavioral analysis techniques with developmentally-informed curricula targeting core ASD deficits 1, 2, 8
Evidence-based comprehensive programs, such as Early Start Denver Model (ESDM) and Early Intensive Behavioral Intervention (EIBI), demonstrate large effect sizes for joint attention skills and moderate effect sizes for expressive language 8, 6
Effective programs typically provide intensive intervention, with mandatory family involvement as co-therapists 1, 2, 8

Pharmacotherapy is not first-line for core ASD symptoms, with behavioral interventions being primary 1, 2
For severe irritability, aggression, or self-injurious behavior, risperidone or aripiprazole may be considered, but carry risks of weight gain, metabolic changes, and somnolence 1, 2

Do not wait for formal diagnosis to begin interventions, as early intensive intervention before age 3 has superior outcomes compared to starting after age 5 1, 2
Do not order extensive medical testing routinely, with genetic testing indicated only with specific clinical indicators 6
Do not use medication as first-line treatment for core ASD symptoms, with behavioral interventions being primary 1, 2
Do not implement interventions without active family involvement, as parent training and participation as co-therapists is essential for generalization and long-term success 1, 2, 8