Hear in lay the bs if statistic based diagnostics.
I am going to presume that the test was the AQ (baron cohen et al)
19 is the peak of the bell curve of scores so 31 is still well out there.
Lets add to this that i will wager that if you were given 2-3 diff variations of the test or even took the same on seoerate occations with different interviewers the scores would be different (probably still cluster in a ranfe but that may be as much as 2-4 points on a the scale(a great deal may deoend on how the interviewer interperates the question)
. I would look into a second opinion if he refuses to look any farther,
I had adhd untill this spring when i started questioning the dx, when i went for a second oppinion with a shrink who is reading the current research instead of the propaganda he gets from his drug reps and he basixally said that it was obvious that i was on tge spectrum, maybe since i only looked at him 2 x in an hour session (but if i had loijed more i would have burst out laughing b/c he looked like col kurts from apocolypse now. )
Mind you he wrote down the address for wro g planet whrm i mentioned it (seeing there is no local support community, or rather there a a couple for teens and pleanty for parents but not for adults kearning how to cope with a world the dont fit in. )
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to be lost I would have needed to know where I was going
"For success in science or art, a dash of autism is essential"
Hans Asperger