Blood Tests for people with Autism

I have just read in todays press that it is possible to do a Blood Test to diagnose children with Autism.  I am surprised as Autism is a characteristic. I do not know if the test will be used for Adults.  I do not know if Asperger Syndrome would show up in a blood test.  I expect for many of us our Autism would not show up in a blood test.

If you have any information or views on the subject please reply.

David Shamash London