The diagnostic criteria for Autism Spectrum Disorder are being revised and will come into effect in 2013. A positive diagnosis must meet criteria A, B, C & D:
A. Persistent deficits in social communication and social interaction across contexts, not accounted for by general developmental delays, and manifest by all three of the following:
- Deficits in social-emotional reciprocity; ranging from abnormal social approach and failure of normal back and forth conversation through reduced sharing of interests, emotions, and affect and response to total lack of initiation of social interaction.
- Deficits in non-verbal communicative behaviours used for social interaction; ranging from poorly integrated- verbal and non-verbal communication, through abnormalities in eye contact and body-language, or deficits in understanding and use of non-verbal communication, to total lack of facial expression or gestures.
- Deficits in developing and maintaining relationships, appropriate to developmental level (beyond those with carers); ranging from difficulties adjusting behaviour to suit different social contexts through difficulties in sharing imaginative play and in making friends to an apparent absence of interest in people
B. Restricted, repetitive patterns of behaviour, interests, or activities as manifested by at least two of the following:
- Stereotyped or repetitive speech, motor movements, or use of objects; (such as simple motor stereotypes, echolalia, repetitive use of objects, or idiosyncratic phrases).
- Excessive adherence to routines, ritualized patterns of verbal or non-verbal behaviour, or excessive resistance to change; (such as motoric rituals, insistence on same route or food, repetitive questioning or extreme distress at small changes).
- Highly restricted, fixated interests that are abnormal in intensity or focus; (such as strong attachment to or preoccupation with unusual objects, excessively circumscribed or perseverative interests).
- Hyper-or hypo-reactivity to sensory input or unusual interest in sensory aspects of environment; (such as apparent indifference to pain/heat/cold, adverse response to specific sounds or textures, excessive smelling or touching of objects, fascination with lights or spinning objects).
C. Symptoms must be present in early childhood (but may not become fully manifest until social demands exceed limited capacities)
D. Symptoms together limit and impair everyday functioning.