DSM-IV-TR behavioral criteria
Social	1a. Marked impairment in the use of multiple nonverbal behaviors, such as eye-to-eye gaze, facial expression, body postures, and gestures to regulate social interaction 1b. Failure to develop peer relationships appropriate to developmental level 1c. A lack of spontaneous seeking to share enjoyment, interests, or achievements with other people (e.g., by a lack of showing, bringing, or pointing out objects of interest) 1d. Lack of social or emotional reciprocity
Communication	2a. Delay in, or total lack of, the development of spoken language (not accompanied by an attempt to compensate through alternative modes of communication, such as gesture or mime) 2b. In individuals with adequate speech, marked impairment in the ability to initiate or sustain a conversation with others 2c. Stereotyped and repetitive use of language or idiosyncratic language 2d. Lack of varied, spontaneous make-believe play or social imitative play appropriate to developmental level
Restricted behavior/Interest	3a. Encompassing preoccupation with one or more stereotyped and restricted patterns of interest that is abnormal either in intensity or focus 3b. Apparently inflexible adherence to specific, nonfunctional routines, or rituals 3c. Stereotyped and repetitive motor mannerisms (e.g., hand or finger flapping or twisting, or complex whole body movements) 3d. Persistent preoccupation with parts of objects
Developmental history	Child had identified delays or any concern with development in the following areas at or before the age of 3 years: Social, Communication, Behavior, Play, Motor, Attention, Adaptive, Cognitive
Autism discriminators	Oblivious to children Oblivious to adults or others Rarely responds to familiar social approach Language primarily echolalia or jargon Regression/loss of social, language, or play skills Previous ASD diagnosis, whether based on DSM-IV-TR or DSM-5 diagnostic criteria Lack of showing, bringing, etc. Little or no interest in others Uses others as tools Repeats extensive dialog Absent or impaired imaginative play Markedly restricted interests Unusual preoccupation Insists on sameness Nonfunctional routines Excessive focus on parts Visual inspection Movement preoccupation Sensory preoccupation
DSM-IV-TR case determination	At least six behaviors coded with a minimum of two Social, one Communication, and one Restricted Behavior/Interest; AND evidence of developmental delay or concern at or before the age of 3 years OR At least two behaviors coded with a minimum of one Social and either one Communication and/or one Restricted Behavior/Interest; AND at least one autism discriminator coded Note: A child might be disqualified from meeting the DSM-IV-TR surveillance case definition for ASD if, based on the clinical judgment of one or more reviewers, there is insufficient or conflicting information in support of ASD, sufficient information to rule out ASD, or if one or more other diagnosed conditions better account for the child’s symptoms

Abbreviation: DSM-IV-TR = Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (Text Revision).