posty

We went to camhs today over our daughter, we were told by the paedatrician that she has elements of various parts of the spectrum, adhd,asd?,asperges & dyspraxia. No diagnosis was given but we think alongside the school that it is asd. She has to have a blood test next week to check for unbalanced chromosome. Does this mean if nothing is found that it rules out asd and why is the paedatrician reluctant to make a diagnosis at this stage?