Intellectual Disability: Diagnosis

Standardized tests such as an IQ test are used to determine a child’s level of intellectual development. A score below 70 on a standardized IQ test indicates that he may have intellectual disability. To be officially diagnosed, one must also exhibit deficiencies in two or more specific areas of adaptive behavior, such as communication skills, interpersonal skills, or daily living skills like getting dressed and using the bathroom. The onset of intellectual disability is usually before birth unless it is accounted for by a specific injury or toxic exposure before the age of 18.