Thank you! [imagine a Union-Jack-waving smiley here] The impression that I've got, when I've tried to talk about testing from the US with my UK doctors is that they dismiss stuff that they're not familiar with from the US because they see doctors in the US as being motivated by money. Unlike the UK, where we have the NHS, which is free to patients at point of use and now (supposedly) evidence-based, US doctors get paid more the more a patient sees them and the more tests and treatments the patients have. I think many UK doctors therefore believe that US doctors will order tests and treatments of unproven and questionable validity in order to make money off patients and they therefore don't take them seriously. This is nuts, of course, to dismiss everything wholesale, but it's certainly my impression that this is the thinking. It's not just ME: a friend of mine had to move to the US to get medical treatment for an agonising pain condition and found the same attitudes from UK doctors. If they're not familiar with the tests, they'll assume they might not be valid. I think this is the case even with tests done in countries with free medical treatment where they don't suspect a profit motive. It's lack of familiarity and maybe they don't know how to assess whether the tests are valid.