Autism is typically diagnosed by a multidisciplinary team of qualified professionals who specialize in child development and mental health. There is no single medical test for autism; instead, these experts rely on behavioral observations, developmental history, and standardized assessments.

The primary professionals who diagnose autism include:

• Developmental Pediatricians: These medical doctors specialize in child growth and are trained to assess developmental milestones while ruling out other potential conditions.
• Child Psychologists: They hold doctorates in psychology and use standardized tools, such as the ADOS-2, to evaluate social communication and behavioral symptoms.
• Neurologists: These specialists focus on brain-related factors and check for neurological comorbidities, such as seizures.
• Child Psychiatrists: Along with the specialists above, they are qualified to conduct formal evaluations.

In many cases, other experts like speech-language pathologists and occupational therapists contribute to the evaluation process to provide a comprehensive view of a child’s needs. For adults, the process may involve neuropsychologists who use tools like the Autism-Spectrum Quotient for self-assessment. Early screening is recommended by the CDC at 18 and 24 months to ensure timely access to support services.