An MRI or CAT scan can also be helpful in diagnosing autism. The important thing is to work with doctors you trust. Second opinions can be very helpful, but when your child has been diagnosed, stick with one doctor so that treatment is uniform and so that your child will get used to this person. Autism is difficult to diagnose and even more difficult to treat, so remember that you should begin to learn as much as possible about the disorder as soon as your doctor identifies it. If you have yet to speak with your doctor about abnormal behavior in your child, do so immediately. By detecting autism early, you give your child a better chance at becoming a high-functioning individual with much more opportunities in life.