Austism/ Asperger's Syndrome cannot be determined through genetic testing. However, genetic testing can rule out other things. The best way to find out if your child has autism or falls somewhere on the autism scale is to have an evaluation done. If your child attends a public school, you can request an evaluation from specialists provided by the school. If not, you can reach out to an MHMR center for a list of resources in obtaining an evaluation from a qualified psychologist/ therapist. You can also discuss your concerns with your child's pediatrician. Health insurance companies tend to provide services when a qualified doctor has made a diagnosis.
The assessments generally used for diagnosis are the ABAS-II (Adaptive Behavior Assessment System, 2nd edition), BASC-2 Parent Rating Scales, Gilliam Autism Rating Scale, Gilliam Asperger's Disorder Scale, and Childhood Autism Rating Scale. Be sure to include information about any developmental delays your child has experienced. Most children with autism have developmental delays, the most common being delayed speech. Studies have also shown that many children with autism had larger heads in infancy and toddler years than typically developing children. (The science behind these studies can be found on wikipedia.)
Autism is mysterious and no two children with autism are exactly alike. However, just as a point of comparison: Our son lacked the sucking reflex at birth. He did walk until he was 2 yrs of age, did not babble until age 3, and did not put two words together to form a meaningful phrase until age 5. He will go to great lengths to avoid eye contact with people he does not know extremely well. He is often confused by language. Sometimes we can engage in meaningful talks with him, and other times, he looks right through us, completely unaware of his surroundings. He can look at a building or an electronic toy and days later reconstruct it using Legos. Yet, he has difficulty with the alphabet at age 7. He shrieks shrill squeals for no apparent reason several times a day and randomly repeats parts of phrases he hears. These are just a few of the more common behaviors seen in many children with autism. Btw, Wikipedia is a great source of dependable information on the subject.
Mommy to 7 yr old son and 5 yr old daughter ~ Homemaker ~ Cultural anthropology student ~ Partner to the world's hottest tech nerd ~ Lover of culinary arts