Autism spectrum disorder with disorder of intellectual development and with impaired functional language with loss of previously acquired skills (Q91954): Difference between revisions

All definitional requirements for both autism spectrum disorder and disorder of intellectual development are met and there is marked impairment in functional language (spoken or signed) relative to the individual’s age, with the individual not able to use more than single words or simple phrases for instrumental purposes, such as to express personal needs and desires. In addition, the individual’s clinical history includes a loss of previously acquired skills, most commonly the loss of language and social skills during the second year of life. Loss of previously acquired skills is rare after three years of age, and when it occurs is more likely to involve cognitive and adaptive skills (e.g., loss of bowel and bladder control, impaired sleep) and to present together with increasing emotional and behavioural disturbance.