Blood Test to diagnose Autism

I have read in todays press that it is possible to do a Blood Test to diagnose Autism.  You can google the info.  I am surprised that it is possible to do a blood test to diagnose Autism as it is really a personality with traits. I do not if it applies to Adults.  I am sure that if there is a real blood test many of us would be found not to have Autism but it would not help as we have the traits.    I do not know if one just has Asperger Syndrome whether that would show up on a blood test.

If you have any information or views on this subject I hope you will reply to me.

David