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Links to our Autism Support Group & Information

How is Autism Diagnosed?

Parents are usually the first to notice unusual behaviors in their child. In many cases, their baby seemed "different" from birth-being unresponsive to people and toys, or focusing intently on one item for long periods of time. The first signs of autism may also appear in children who had been developing normally. When an affectionate, babbling toddler suddenly becomes silent, withdrawn, violent, or self-abusive, something is wrong.

Even so, years may go by before the family seeks a diagnosis. Well-meaning friends and relatives sometimes help parents ignore the problems with reassurances that "Every child is different," or "Janie can talk-she just doesn't want to!" Unfortunately, this only delays getting appropriate assessment and treatment for the child.

Indicators of Normal Development

Age Skills or Abilities Awareness and Thinking Communication Movement Social Self-help
birth- 3 months Responds to new sounds Follows movement of hands with eyes Looks at object and people Coos and makes sounds Smiles at mother's voice Waves hands and feet Grasps objects Watches movement of own hands Enjoys being tickled and held Makes brief eye contact during feeding Opens mouth to bottle or breast and sucks
3-6 months Recognizes mother Reaches for things Turns head to sounds and voices Begins babbling Imitates sounds Varies cry Lifts head and chest Bangs objects in play Notices strangers and new places Expresses pleasure or displeasure Likes physical play Eats baby food from spoon Reaches for and holds bottle
6-9 months Imitates simple gestures Responds to name Makes nonsense syllables like gaga Uses voice to get attention Crawls Stands by holding on to things Claps hands Moves objects from one hand to the other Plays peek-a-boo Enjoys other children Understands social signals like smiles or harsh tones Chews Drink from a cup with help
9-12 months Plays simple games Moves to reach desired objects Looks at pictures in books Waves bye-bye Stops when told "no" Imitates new words Walks holding on to furniture Deliberately lets go of an object Makes markes with a pencil or crayon Laughs aloud during play Shows preference for one toy over another Responds to adult's change in mood Feeds self with fingers Drinks from cup
12-18 months Imitates unfamiiar sounds and gestures Points to a desired object Shakes head to mean "no" Begins using words Follows simple commands Creeps upstairs and downstairs Walks alone Stacks blocks Repeats a performance laughed at Shows emotions like fear or anger Returns a kiss or hug Moves to help in dressing Indicates wet diaper
18-24 months Identifies parts of own body Attends to nursery rhymes Points to pictures in books Uses two words to describe actions Refers to self by name Jumps in place Pushes and pulls objects Turns pages of book one by one Uses fingers and thumb Cries a bit when parents leave Becomes easily frustrated Pays attention to other children Zips Removes clothes without help Unwraps things
24-36 months Matches shapes and objects Enjoys picture books Recognizes self in mirror Counts to ten Joins in songs and rhythm Uses three-word phrases Uses simple pronouns Follows two instructions at a time Kicks and throws ball Runs and jumps Draws straight lines Strings beads Pretends and plays make believe Avoids dangerous situations Initiates play Attempts to take turns Feeds self with spoon Uses toilet with some help

Diagnostic procedures

To date, there are no medical tests like x-rays or blood tests that detect autism. And no two children with the disorder behave the same way. In addition, several conditions can cause symptoms that resemble those of autism. So parents and the child's pediatrician need to rule out other disorders, including hearing loss, speech problems, mental retardation, and neurological problems. But once these possibilities have been eliminated, a visit to a professional who specializes in autism is necessary. Such specialists include people with the professional titles of child psychiatrist, child psychologist, developmental pediatrician, or pediatric neurologist.

Autism specialists use a variety of methods to identify the disorder. Using a standardized rating scale, the specialist closely observes and evaluates the child's language and social behavior. A structured interview is also used to elicit information from parents about the child's behavior and early development. Reviewing family videotapes, photos, and baby albums may help parents recall when each behavior first occurred and when the child reached certain developmental milestones. The specialists may also test for certain genetic and neurological problems.

Specialists may also consider other conditions that produce many of the same behaviors and symptoms as autism, such as Rett's Disorder or Asperger's Disorder. Rett's Disorder is a progressive brain disease that only affects girls but, like autism, produces repetitive hand movements and leads to loss of language and social skills. Children with Asperger's Disorder are very like high-functioning children with autism. Although they have repetitive behaviors, severe social problems, and clumsy movements, their language and intelligence are usually intact. Unlike autism, the symptoms of Asperger's Disorder typically appear later in childhood.

Diagnostic criteria

After assessing observations and test results, the specialist makes a diagnosis of autism only if there is clear evidence of:

  • poor or limited social relationships
  • underdeveloped communication skills
  • repetitive behaviors, interests, and activities.

People with autism generally have some impairment within each category, although the severity of each symptom may vary. The diagnostic criteria also require that these symptoms appear by age 3.

However, some specialists are reluctant to give a diagnosis of autism. They fear that it will cause parents to lose hope. As a result, they may apply a more general term that simply describes the child's behaviors or sensory deficits. "Severe communication disorder with autism-like behaviors," "multi-sensory system disorder," and "sensory integration dysfunction" are some of the terms that are used. Children with milder or fewer symptoms are often diagnosed as having Pervasive Developmental Disorder (PDD).

Although terms like Asperger's Disorder and PDD do not significantly change treatment options, they may keep the child from receiving the full range of specialized educational services available to children diagnosed with autism. They may also give parents false hope that their child's problems are only temporary.


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