Thanks Glynis. I'm in Canada so not sure I could even get tested at Mayo. I do pass through the London airport 8-10 times a year though so I will contact Breakspear and see if they will test it for me. I am interested in other testing by them as well. I found a post by you from 2 years ago mentioning Breakspear tests it properly. Hopeuflly they still offer the test.