Not a parent, but I did read my own report. It wasn't a mistake, but it sure was shocking, because it was before I got into real touch with other autistic people. I thought I already presented a very very good picture at 18 years, just very light maybe, but the whole report made it sound as if I was a bit of a nut case. I take it this is the way medical reports can sound, may usually sound like to other people than medical staff, but it is still shocking and it caused me some feelings of helplessness and being overwhelmed by the information that was presented to my eyes on only a few pages.
I found that a good mix between everyday experience, one's feelings and the medical view of the current ongoings makes me feel fine.