Differential diagnosis and co-existing conditions

• The behaviours are not better explained by another psychiatric disorder (notably Attention-deficit/hyperactivity disorder - F90) or specific developmental disorder of receptive language, deafness or Learning disability - F70.
  
  
• It is important to exclude identifiable causes, particularly chromosomal abnormalities, the fragile X syndrome and tuberous sclerosis.
  
  Some three-quarters of children with core autism have a performance IQ below the normal range.
  
  
• One-third of children with autism develop epilepsy, often in adolescence or early adult life. The possibility of epilepsy should be carefully investigated.

Last edited: 5/12/2003

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