Autism spectrum disorder?

My son is 3.5 and still yet to be tested but started seeing the signs after he gave me the heart attack of a lifetime. He was drawn to fans, obsessed with colors, letters and numbers, lining up cars and disinterested in most his other toys. The scary signs were his absolute fearlessness (with exceptions to noises) and always drawn to water, and self abusive when upset. I have a cousin who was diagnosed with Asperger's syndrome (in the autism spectrum) and was able to see the similarities as well. All in all it never hurts to get tested (in my case cause he's high functioning) be persistent and make your concerns heard.