I would echo what has already been said. There is a way of doing the challenge test though if you are dead set on doing it that is safer and Cutler does write about in 'Amalgam illness' (though still doesnt recommend it). He suggests spreading the dose over 24 hours and doing a collection of all urine. You would have to read further.

Virago I had a Kelmer test a few years ago as well. My percentage came out at 2800% which i was shocked about. Hope its gone down now, but i dont think i'll have another test to find out