@rwinney Hi Rachel - Like you, I had lots of testing done for 3 years at 3 teaching hospitals and had all of the written reports. Idiopathic, all three. I decided to apply at Mayo Rochester. I sent all reports to Mayo with a letter implying that perhaps I could be a challenge for their doctors. I tried to give them a solid reason to accept me. Was accepted in Nov 2019, went to Mayo Feb 2020 prior to pandemic and I am sure back then the staffing was greater prior to the pandemic. Mayo said idiopathic as well however, they did some tests that the other hospitals did not do. If turned down, I would apply again after 9 - 12 months and provide any changes in condition from the prior application. Nothing to lose and don't get discouraged.