myself wrote:
The spectrum as a completely defined mathematical entity does not exist.
What I mean by this is that there is no precise measurement - or even a precise means of measuring ones position on the spectrum.
All of the tests are subjective based on the opinions and observations of doctors and on how individuals perform in certain tests, environments etc.
With Aspergers in particular, you can't get a blood test that says "you're at 40% on the spectrum".
Your son may indeed be worsening but it could just as easily be environmental factors such as the school, teachers, stress or even things at home. Give some consideration to those factors first.