Autism and chelation: My questions

I've some questions regarding chelation as an alternative treatment for autistics.

1. How possible is it to get a heavy metal level test from a laboratory unrelated to anything DAN! or Generation Rescue. It often sounds like most of the tests are sent to Laboratorie Philippe Auguste in Paris, France.

2. Regarding Laboratorie Philippe Auguste, do they market alternative treatments for cardiovascular disease? Have they ever been related to marketting of chelation as an alternative treatment for cardiovascular disease?

3. Have autistics who have received chelation ever had anything specific to their development that is not seen in autistics who have not received chelation?

4. Is it commonly accepted in the medical community that autistics don't excrete heavy metals in the same levels as others do?