Exams and Tests
The American Academy of Pediatrics (AAP) recommends screening children for autism during regularly scheduled Reference well-child visits.Reference 4 This policy helps doctors identify signs of autism early in its course. Early diagnosis and treatment can help the child reach his or her full potential.
When a developmental delay is recognized in a child, further testing can help a doctor find out whether the problem is related to autism, another Reference pervasive developmental disorder (PDD), or a Reference condition with similar symptoms, such as Reference language delays Opens New Window or Reference avoidant personality disorder Opens New Window. If your primary care provider does not have specific training or experience in developmental problems, he or she may refer your child to a specialist—such as a developmental pediatrician, a psychiatrist, a speech therapist, a psychologist, or a child psychiatrist—for the additional testing.
Various guidelines and questionnaires are used to help a doctor determine the
specific type of developmental delay a child has. These include:Reference 2
- Reference Medical history. During the medical history interview, a doctor asks general questions about a child's development, such as whether a child shows parents things by pointing to objects. Young children with autism often point to items they want, but do not point to show parents an item and then check to see if parents are looking at the item being pointed out.
- Diagnostic guidelines for autism. The American Association of Childhood and Adolescent Psychiatry (AACAP) has established guidelines for diagnosing autism.Reference 2 The criteria are designed so a doctor can assess a child's behavior relating to core symptoms of autism.
- Clinical observations. A doctor may want to observe the developmentally delayed child in different situations. The parents may be asked to interpret whether certain behaviors are usual for the child in those circumstances.
- Developmental and intelligence tests. The AACAP also recommends that tests be given to evaluate whether a child's developmental delays affect his or her ability to think and make decisions.
Physical assessments and laboratory tests. Other tests may be used to determine whether a
physical problem may be causing symptoms. These tests include:
- Reference Physical exam, including head circumference, weight, and height measurements, to determine whether the child has a normal growth pattern.
- Reference Hearing tests, to determine whether hearing problems may be causing Reference developmental delays Opens New Window, especially those related to social skills and language use.
- Reference Testing for lead poisoning, especially if a condition called Reference pica Opens New Window (in which a person craves substances that are not food, such as dirt or flecks of old paint) is present. Children with developmental delays usually continue putting items in their mouth after this stage has passed in normally developing children. This practice can result in lead poisoning, which should be identified and treated as soon as possible.
Other lab tests may be done under specific circumstances. These tests include:
- Reference Chromosomal analysis, which may be done if intellectual disability is present or there is a family history of intellectual disability. For example, fragile X syndrome, which causes a range of below-normal intelligence problems as well as autistic-like behaviors, can be identified with a chromosomal analysis.
- An Reference electroencephalograph (EEG), which is done if there are symptoms of seizures, such as a history of staring spells or if a person reverts to less mature behavior (developmental regression).
- Reference MRI Opens New Window, which may be done if there are signs of differences in the structure of the brain.
All doctors who see infants and children for well-child visits should watch for early signs of developmental disorders. Reference Developmental screening tools, such as the Ages and Stages Questionnaire or the Modified Checklist for Autism in Toddlers (M-CHAT), can help assess behavior.
If a doctor discovers the following obvious signs of developmental delays, the child should immediately be evaluated:Reference 4
- No babbling, pointing, or other gestures by 12 months
- No single words by 16 months
- No 2-word spontaneous phrases by 24 months, with the exception of repeated phrases (echolalia)
- Any loss of any language or social skills at any age
If there are no obvious signs of developmental delays or any unusual indications from the screening tests, most infants and children do not need further evaluation until the next well-child visit.
But children who have a sibling with autism should continue to be closely monitored, because they are at increased risk for autism and other developmental problems.
When socialization, learning, or behavior problems develop in a person at any time or at any age, he or she should also be evaluated.
|By:||Reference Healthwise Staff||Last Revised: Reference April 3, 2012|
|Medical Review:||Reference John Pope, MD - Pediatrics
Reference Fred Volkmar, MD - Child and Adolescent Psychiatry