"best" type of adrenal testing?
I am new to adrenal issues, but I'm expecting next week my endo will (at the request of a couple other mds I've seen, including my primary) order tests to check cortisol levels (and maybe some other tests?). I'm hypothyroid (Hashimoto's) with some unresolved symptoms, and I'm a bit confused by all the testing types for cortisol levels.
I've encountered descriptions by authoritative sources (like Medline and NIH) indicating saliva tests, ACTH stimulation tests (which seem to require injections?), and 24 hour free urine testing are all appropriate testing. Is there any preference or any of these that are considered more accurate? Can I express a preference without mucking up my potential lab results? Is one test considered more thorough?