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Diseases » Autism » Diagnosis

Diagnosis of Autism

Diagnostic Test list for Autism:

The list of medical tests mentioned in various sources as used in the diagnosis of Autism includes:

  • Hearing tests - to see if the problem is hearing impairment or deafness rather than autism.
  • Lead tests
  • Autism screening tests
    • The Ages and Stages Questionnaire
    • The BRIGANCE® Screens
    • The Child Development Inventories
    • The Parents’ Evaluation of Developmental Status
    • Pervasive Developmental Disorders Screening Test (PDDST)
    • Checklist for Autism in Toddlers (CHAT)
    • Australian Scale for Asperger’s Syndrome
    • Denver II (formerly Denver Developmental Screening Test-Revised) - no longer recommended.
    • GARS
    • PIA
    • ADI-R
  • Observation tests
  • Neurological Evaluation
  • Clinical Diagnosis DSM-IV
  • Developmental Evaluations
  • Laboratory tests

Tests and diagnosis discussion for Autism:

Autism Fact Sheet: NINDS (Excerpt)

Autism is classified as one of the pervasive developmental disorders. Some doctors also use terms such as "emotionally disturbed" to describe people with autism. Because it varies widely in its severity and symptoms, autism may go unrecognized, especially in mildly affected individuals or in those with multiple handicaps. Researchers and therapists have developed several sets of diagnostic criteria for autism. Some frequently used criteria include:*

  • Absence or impairment of imaginative and social play
  • Impaired ability to make friends with peers
  • Impaired ability to initiate or sustain a conversation with others
  • Stereotyped, repetitive, or unusual use of language
  • Restricted patterns of interests that are abnormal in intensity or focus
  • Apparently inflexible adherence to specific routines or rituals
  • Preoccupation with parts of objects

(Source: excerpt from Autism Fact Sheet: NINDS)

Autism: NIMH (Excerpt)

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 When an affectionate, babbling toddler suddenly becomes silent, withdrawn, violent, or self-abusive, something is wrong.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. (Source: excerpt from Autism: NIMH)

Autism: NIMH (Excerpt)

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. (Source: excerpt from Autism: NIMH)

Autism: NIMH (Excerpt)

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. (Source: excerpt from Autism: NIMH)

Diagnosis of Autism: medical news summaries:

The following medical news items are relevant to diagnosis and misdiagnosis issues for Autism:


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