How is autism diagnosed?

There are no medical or genetic tests that can detect autism. These can only rule out other conditions. A diagnosis of autism requires a sensitive and experienced doctor to observe the child very carefully, ask the parents about the development of the child, and then objectively follow internationally recognized criteria for diagnosis. Onset may occur at birth, or a child may have a period of normal development followed by a deterioration of verbal and social skills around 1 1/2-2 1/2 years. Where onset is at birth, the disorder can be detected as early as a year. Autism may occur alongside conditions such as mental retardation and hyperactivity, but the autistic traits in the person are typically what require attention.