What is the Autism Diagnosis Interview-Revised (ADI-R)?
The Autism Diagnostic Interview-Revised (ADI-R) is an investigator-based diagnostic tool designed to assess autism spectrum disorder (ASD) in children and adults with a mental age of at least 24 months. This semi-structured interview is administered by a trained clinician or psychologist and is conducted with the individual’s parents or primary caregivers to obtain a detailed developmental history. The autism diagnosis interview ADI process offers vital insights into early developmental milestones and behaviors.
The ADI-R consists of 93 standardized questions organized into key domains that include reciprocal social interactions, communication and language, restricted and repetitive behaviors, and other clinically relevant behaviors such as aggression or self-injury. It also includes questions that help determine whether developmental abnormalities were present before the age of 36 months—an important criterion in diagnosing autism spectrum disorders.
The assessment typically takes between 1.5 to 2.5 hours to complete and requires a quiet, distraction-free environment. Interviewers use open-ended questions and follow-up probes to gather detailed responses, which are then scored using standardized ADI-R algorithms. These scores assist clinicians in evaluating whether the individual meets diagnostic criteria for autism.










