This site is very helpful with testing for various toxic exposures. To cite a quack who claims to be a quackbuster to smear a reputable medical lab is disgusting, and shows once again how biased WOT ratings really are.
Want to learn the details about how quackwatch is run by a quack, go to the following link, and don't let the WOT rating discourage you from going there and making up your own mind: http://www.quackpotwatch.org/quackpots/quackpots/barrett.htm
Quackery at its finest
Read this review of "Doctor's Data"'s practices: http://www.slate.com/id/2215128/pagenum/all/
It's not pretty.
Reputable lab with extremely helpful panels available. I use them a lot in my private practice.